TinnerFlow™1st YearDampers, Fire/Smoke & Life SafetyField Reference
Crescent wrenches adjust under load and will slip on soft brass hex nuts. Throw the adjustable wrench back in the box. Always use a dedicated ratcheting trade quad-wrench or a fixed 6-point box wrench sized exactly to the standard 3/8-inch or 7/16-inch.
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You are locking down a manual volume control damper setting for the air balancing crew. You use a standard adjustable crescent wrench to tighten the locking nut on the regulator dial, but the loose jaws slip, rounding off the brass hex nut completely.
Crescent wrenches adjust under load and will slip on soft brass hex nuts. Throw the adjustable wrench back in the box. Always use a dedicated ratcheting trade quad-wrench or a fixed 6-point box wrench sized exactly to the standard 3/8-inch or 7/16-inch. The likely recovery is to check the tool setup, correct the prep or technique if it is within your assignment, and bring the journeyman or foreman clean information before the work creates rework overhead.
Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.