Field Tools, Lift Checks, And Closeout

Aviation snips are color-coded by cut direction. Using wrong snip creates jagged edges.

Different substrates need different drill bits.

Dead batteries stop work. Need to manage charging and know when too weak.

Scissor lifts require daily pre-use inspection. Missing items causes accidents.

Moving lifts requires awareness of overhead hazards.

Before ceilings close, ductwork must be inspected. Missing this walk creates hidden problems.

Closeout requires photos of completed work. Poor photos delay payment and create disputes.

Foremen and lead apprentices track material usage and forecast needs.

Foremen deliver daily safety talks. Apprentices need to know how to participate.

When duct modified in field, patch plates cover cutouts. Wrong size or attachment creates leaks.

Sometimes duct must be notched for beams. Notching weakens duct and may need reinforcement.

Static pressure test holes must be located correctly for accurate readings.

Understanding fan curves helps troubleshoot airflow problems.

Louvers have free area less than face area. Using face area for airflow causes undersizing.

Outside air intakes require bird screens to prevent blockage and contamination.

Damper actuators must be mounted correctly for proper operation.

Controls integration requires documentation of what was installed.

Condensate drains must slope and have a trap to prevent air loss and contamination.

VAV boxes may need vibration isolation. Wrong isolator causes noise transmission.

Duct openings must be protected during construction to prevent debris entry.

Diffusers have a neck size (duct connection) and face size (visible ceiling dimension). Confusing them causes ordering errors.

Slot diffusers require precise alignment and proper support. Misalignment looks bad and affects airflow.

Return and supply devices look similar but function differently. Installing wrong type affects system performance.

Smoke detectors in ductwork must be located per code for proper detection.

Exhaust fans need backdraft dampers to prevent reverse airflow when fan is off.

Grease filters in kitchen hoods must be properly sized and accessible for cleaning.

Lab exhaust may require special materials like stainless steel or coated duct.

Duct systems may require labeling for identification, flow direction, or hazard warning.

Field changes must be documented on as-built drawings for future maintenance.

Some projects require color-coded ductwork for system identification.

Insulation must be stopped at fire dampers to prevent fire spread through insulation.

Buildings have expansion joints that ductwork must accommodate without breaking.

Corrosive environments like pools or chemical plants require special duct materials.

Some spaces require sound attenuators or acoustic treatment in ductwork.