Watch the last few inches: alignment, gasket contact, curb corners, duct openings, roof membrane, service clearance, and no fingers under the load. If it is not lining up, stop and call it out.
Stop and verify the curb, unit, and duct openings before the connection gets locked in. A curb or opening mismatch is cheap to catch before the set and ugly after the unit is sitting there.
The unit is close to landing, but it looks like the curb/openings/gasket are not lining up. Do you want the pick paused before it sits all the way down?
Watch out
Do not assume the curb is right just because it is installed, and do not field-adapt the opening without approval.
Check
Match unit tag to curb tag
Check supply/return openings and orientation
Confirm access/service side and connection points
Photograph mismatches before the set
Steps
Stay out of pinch points and do not put fingers between unit and curb.
Watch whether the unit is rotated, offset, hanging up on curb edges, or crushing gasket unevenly.
Confirm supply/return openings line up and no loose material is trapped under the base.
Look for roof membrane damage, curb damage, or crushed gasket after landing.
Tell the foreman before bolts, screws, duct tie-ins, gas/electrical, or final connections proceed.
Say this to your foreman
The unit is close to landing, but it looks like the curb/openings/gasket are not lining up. Do you want the pick paused before it sits all the way down?