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    cristiano1948's Avatar
    cristiano1948 Posts: 1, Reputation: 1
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    #1

    Sep 23, 2010, 05:16 PM
    Show me technics to cut duct board
    How can I cut a fiberglass board to reduce from 17" to 14" duct
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    Sep 23, 2010, 05:30 PM
    If this is a rectangular duct, slit the four corners, adjust the sides to fit the new duct , cut the excess at 45 degrees so you have a nice smooth transition and then tape it together with metal tape. It should look like a rectangular funnel.
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