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Oct 8 at 20:53 comment added Oliver Street @Roberto I wouldn't ask a new homeowner to file a thin wall duct. The odds of the homeowner having a round file small enough and the skill to use it to good effect are nil. The hole edges will snag a small blob of lint and it won't make any difference in the long run.
Oct 8 at 19:17 comment added Roberto I'd personally also make sure the holes drilled in the duct are "clean". Maybe file them down gently, if needed. Specifically, I'd want to make sure there were no raised edges inside the duct that would catch lint and make a spot for it to clog or otherwise spoil flow.
Oct 7 at 13:27 history answered Machavity CC BY-SA 4.0