TinnerFlow
Grease Duct Systems ยท Grease Exhaust Systems

Grease duct access door

Cleaning access

Life-safety system.
The approved design, adopted code, qualified procedure, and exact manufacturer instructions control this installation.
ConnectionListed access door or welded frame
SupportLocal reinforcement/support as required

Before you start

  • Grease duct is a fire/life-safety system. Verify the approved design, adopted code, hood and fan requirements, listed enclosure or shaft details, and inspection hold points before fabrication or installation.
  • Confirm the exact access-door type, listing or welded-frame detail, size, location, orientation, cleaning purpose, enclosure interface, and service clearance.
  • Verify the door location provides useful reach into the duct and will not be buried by ceilings, walls, equipment, or insulation.
  • Inspect gasket, latches, frame, cover, and reinforcement requirements.
  • Do not substitute a standard HVAC access door for a grease-duct-rated or approved assembly.

Tools and materials

Approved listed grease-duct access door or welded-frame assembly, template, layout tools, cutting tools approved for the material, reinforcement when required, welding or manufacturer hardware, gasket, latches, sealant if specified, and finish protection.

Lay it out

  1. Choose the accessible side and verify the door can open or be removed completely.
  2. Lay out the opening without cutting through a seam, joint, required reinforcement, or support.
  3. Coordinate the door with the grease-duct enclosure or fire-wrap access assembly.

Set and support it

  1. Support the duct locally before cutting the opening.
  2. Add only the reinforcement required by the approved door detail.
  3. Keep the frame flat so the cover and gasket can seat evenly.

Make the connection

  1. 1

    Verify the approved template and cutout size.

  2. 2

    Mark and cut the opening cleanly without leaving sharp projections inside the duct.

  3. 3

    Install the listed frame or weld the approved frame continuously and liquid-tight.

  4. 4

    Install gasket, cover, latches, and any enclosure-access components in the required order.

  5. 5

    Open and close the door several times.

  6. 6

    Inspect the inside for sharp edges, debris, and cleaning obstructions.

  7. 7

    Label and document the access location before concealment.

Check the install

  • The door opens fully or removes without obstruction.
  • The gasket seats evenly and latches hold securely.
  • The frame is liquid-tight and does not weaken or distort the duct.
  • The location provides a usable cleaning path.
  • The enclosure or wrap remains complete around the access assembly.

Common mistakes

  • Installing a generic access door not approved for grease duct.
  • Locating the door where a wall or ceiling prevents opening.
  • Cutting through reinforcement or too close to a joint.
  • Leaving sharp edges or metal debris inside the duct.

Stop and ask

Stop if the door is not approved for the system, the opening affects required reinforcement, access will be buried, or the enclosure interface does not match a tested or approved detail.