TinnerFlow™1st YearDuct AssemblyYELLOW · Check First
If you don't have a hand brake tool, lay the flat sheet over a clean, sharp 90-degree edge (like a piece of heavy angle iron or unistrut). * Mark an 'X' from corner to corner. Lightly apply downward pressure while tracking the lines to crease the sheet slightly. This prevents the large flat surface from flexing and vibrating ("oil-canning") when the fan kicks on.
If you don't have a hand brake tool, lay the flat sheet over a clean, sharp 90-degree edge (like a piece of heavy angle iron or unistrut). * Mark an 'X' from corner to corner. Lightly apply downward pressure while tracking the lines to crease the sheet slightly. This prevents the large flat surface from flexing and vibrating ("oil-canning") when the fan kicks on.
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Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.