TinnerFlow™3rd YearGrease Duct & Specialty ExhaustCheck first
If the blast gate housing ovalizes the pipe, reinforce the connection so the gate stays square and the pipe stays round.
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Thin spiral wall can distort when a heavy blast gate or clamp loads one area. Once the barrel goes oval, the internal gate slide may bind.
Loosen the housing, check pipe roundness, and add the approved sleeve/reinforcing ring/backing collar or replace the connection with a heavier fitting section before retightening.
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.