20 in x 25 in x 16 in duct square to round.
Bending sheet metal for ductwork.
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All ductwork comes standard with stiffening beads.
Insert the 1 4 inch lip into the opening of the lock form.
This locks the corner of the duct together.
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Hammer this lip over and down onto the 1 4 inch corner bend.
You may have to use the sheet metal hammer to tap it in.
After the lip is inserted there will be a metal ridge protruding above the 1 4 inch corner bend.
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