Jim Baird Posted October 30, 2009 Report Share Posted October 30, 2009 Every house shows me something I have never seen. This one showed me a plywood section of an air handling system. A box right past the supply end of the unit that has ducts mounted on three of its faces. Site-built ingenuity, no? Is there any way that plywood could pass muster on flame spread, smoke development, etc? Quote Link to comment Share on other sites More sharing options...
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