Safety and Jobsite Practices
The Safety and Jobsite Practices domain tests whether you can install air distribution systems without injuring yourself, damaging the building, or creating hazards for other trades. Items focus on hazard recognition, PPE selection, ladder and fall safety, lockout/tagout, confined spaces, power-tool use, and housekeeping.
Core rules and concepts
- Wear cut-resistant gloves and safety glasses with side shields when handling galvanized sheet metal; add hearing protection for loud jobsite equipment and a dust mask or respirator when cutting fiberglass or duct board.
- Set extension ladders at a 4:1 slope, secure the top and bottom, and extend the ladder at least 3 ft above the landing. Maintain three points of contact.
- Fall protection is generally required at 6 ft in construction. Guard openings and never stand on the top two rungs.
- Follow lockout/tagout before removing guards or servicing fan motors; verify zero energy.
- Treat permit-required confined spaces as permit spaces. Keep walkways clear, cap open duct ends, and control cords and scrap.
Worked example
A technician must reach a 12-ft eave. The 4:1 rule puts the base 3 ft from the wall. The ladder must extend 3 ft above the eave, so the required reach is about 15 ft; a 16-ft extension ladder is selected. The technician checks the footing, ties off the top, and keeps the base clear.
Traps that cost marks
Using a ladder as a work platform, standing on the top two rungs, disabling a guard for a quick adjustment, skipping lockout because the fan is on a disconnect, and wearing loose gloves near a rotating blower. Another common error is assuming a short job needs no eye protection while drilling overhead.