Use this as a route, not a substitute for supervision.
Plans, specs, code, manufacturer instructions, approved submittals, and foreman direction always win.
Grease Duct, Kitchen Exhaust & Industrial Exhaust
Search inside this category, filter by apprentice year or severity, then open an answer for quick answer, field steps, ask-foreman rule, and do-not-do warning.
What do I do when not recognizing grease duct versus regular exhaust duct?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. If the duct serves a hood/kitchen/process area or has welded/special construction, do not treat it like regular exhaust until it is identified.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Trace what equipment it serves and ask the foreman to confirm the system type.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when cutting into grease duct without approval?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Unauthorized holes in grease/special exhaust can create fire, leakage, inspection, and liability problems.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Verify whether any penetration or modification is allowed and who is qualified/responsible before touching it.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply. Do not drill, screw, notch, tap, or cut into grease/special exhaust without approval.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when missing cleanout/access requirements?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Cleanouts and access points are inspection/maintenance items, not optional pieces to work around.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Check whether access is missing, blocked, too small, or pointed the wrong way before cover.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply. Do not cover, block, or delete cleanout/access locations.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when wrong slope/drainage on kitchen exhaust?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Grease or residue collecting in the wrong place is a red flag.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Flag low spots, wrong slope, trap points, or drainage questions for the foreman before closing the run.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when using non-approved sealant/tape on grease duct?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Do not use random tape, mastic, or caulk on special exhaust because the approved sealing method may be listed/project-specific.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Verify the approved seal/weld/gasket method from the spec/submittal.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply. Do not patch grease/special exhaust with normal duct tape or generic sealant.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when not verifying welded/flanged/listed system requirements?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Weld/seal quality on grease/special exhaust is not apprentice guesswork.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Ask who is qualified/responsible for welding, leak checks, and inspection documentation.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when support/hanger not rated for grease duct weight/system?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Stop before cutting, drilling, fastening, patching, sealing, relocating, or changing anything until the foreman confirms the approved detail and who is allowed to do that work.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when clearance to combustibles not verified?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Clearance, wrap, and enclosure issues are fire/life-safety and inspection issues.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Verify clearance-to-combustibles, wrap/enclosure, fire rating, and inspection hold points with the foreman/AHJ path.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when fire wrap/shaft detail misunderstood?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Clearance, wrap, and enclosure issues are fire/life-safety and inspection issues.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Verify clearance-to-combustibles, wrap/enclosure, fire rating, and inspection hold points with the foreman/AHJ path.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when access panel blocked after ceiling/wall close-up?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Cleanouts and access points are inspection/maintenance items, not optional pieces to work around.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Check whether access is missing, blocked, too small, or pointed the wrong way before cover.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply. Do not cover, block, or delete cleanout/access locations.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when grease duct routed through space without checking code/spec?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Stop before cutting, drilling, fastening, patching, sealing, relocating, or changing anything until the foreman confirms the approved detail and who is allowed to do that work.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when industrial exhaust material not matched to contaminant?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Special exhaust may carry hazards that are not obvious from the duct shape.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Confirm system type, contents, material, labeling, and who is authorized before modifying anything.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when abrasive dust duct requires heavier construction but not recognized?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Stop before cutting, drilling, fastening, patching, sealing, relocating, or changing anything until the foreman confirms the approved detail and who is allowed to do that work.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when condensate/chemical exhaust slope or drain missed?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Grease or residue collecting in the wrong place is a red flag.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Flag low spots, wrong slope, trap points, or drainage questions for the foreman before closing the run.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when cleanout spacing not coordinated before install?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Cleanouts and access points are inspection/maintenance items, not optional pieces to work around.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Check whether access is missing, blocked, too small, or pointed the wrong way before cover.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply. Do not cover, block, or delete cleanout/access locations.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when not protecting grease duct from dents/leaks during handling?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Damage that changes drainage, clearance, seal, or cleaning access needs to be called out before it gets hidden.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Photograph dents/damage and ask whether repair or replacement is required.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when wrong transition/fitting creates grease trap point?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Grease or residue collecting in the wrong place is a red flag.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Flag low spots, wrong slope, trap points, or drainage questions for the foreman before closing the run.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when access door installed where it cannot be serviced?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Cleanouts and access points are inspection/maintenance items, not optional pieces to work around.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Check whether access is missing, blocked, too small, or pointed the wrong way before cover.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply. Do not cover, block, or delete cleanout/access locations.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when not verifying fan connection/flex connector requirements?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Hood/fan/equipment connections affect access, vibration, drainage, cleaning, and inspection.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Verify equipment tag, connection detail, service access, and cleaning access before fastening.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when not coordinating kitchen hood connection with hood installer?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Hood/fan/equipment connections affect access, vibration, drainage, cleaning, and inspection.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Verify equipment tag, connection detail, service access, and cleaning access before fastening.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when welded duct heat/fire watch expectations unclear?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Weld/seal quality on grease/special exhaust is not apprentice guesswork.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Ask who is qualified/responsible for welding, leak checks, and inspection documentation.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when not checking roof penetration/curb detail?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Unauthorized holes in grease/special exhaust can create fire, leakage, inspection, and liability problems.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Verify whether any penetration or modification is allowed and who is qualified/responsible before touching it.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply. Do not drill, screw, notch, tap, or cut into grease/special exhaust without approval.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when industrial exhaust hanger conflicts with maintenance path?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Special exhaust may carry hazards that are not obvious from the duct shape.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Confirm system type, contents, material, labeling, and who is authorized before modifying anything.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when apprentice treats high-risk exhaust as normal duct?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Stop before cutting, drilling, fastening, patching, sealing, relocating, or changing anything until the foreman confirms the approved detail and who is allowed to do that work.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when not escalating when grease/industrial detail is missing?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Special exhaust may carry hazards that are not obvious from the duct shape.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Confirm system type, contents, material, labeling, and who is authorized before modifying anything.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when not checking hood connection dimensions before installing grease duct?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Hood/fan/equipment connections affect access, vibration, drainage, cleaning, and inspection.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Verify equipment tag, connection detail, service access, and cleaning access before fastening.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when grease duct access panel facing inaccessible side?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Cleanouts and access points are inspection/maintenance items, not optional pieces to work around.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Check whether access is missing, blocked, too small, or pointed the wrong way before cover.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply. Do not cover, block, or delete cleanout/access locations.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when slope direction wrong on horizontal grease duct?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Grease or residue collecting in the wrong place is a red flag.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Flag low spots, wrong slope, trap points, or drainage questions for the foreman before closing the run.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when not checking if cleanout spacing is required?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Cleanouts and access points are inspection/maintenance items, not optional pieces to work around.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
- Check whether access is missing, blocked, too small, or pointed the wrong way before cover.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply. Do not cover, block, or delete cleanout/access locations.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction
Verification basis
Project drawings/specs, approved details, manufacturer instructions where applicable, site rules, and foreman direction.Route: Grease Duct, Kitchen Exhaust & Industrial Exhaust / Question-matched verified starter / Project-specific details still need approved info
What do I do when using normal mastic on grease duct?
Tap to open
📖 Verified core answer
High-risk starter answer — treat grease duct, hood exhaust, kitchen exhaust, lab exhaust, and special exhaust as red-zone work. Stop before cutting, drilling, fastening, patching, sealing, relocating, or changing anything until the foreman confirms the approved detail and who is allowed to do that work.
🛠️ Field verification checklist
- Confirm whether this is grease duct, kitchen exhaust, lab exhaust, industrial exhaust, or normal exhaust.
- Check the approved drawings/spec/submittal.
- Look for cleanout/access, clearance, enclosure/wrap, weld/seal, slope/drainage, and inspection requirements.
🗣️ Ask the foreman
Route options
🚫 Do not do this
Do not assume normal galvanized duct rules apply.
Why this matters
NFPA/local mechanical code/AHJ; project grease/special exhaust spec; approved submittal; foreman/qualified trade direction