mijotter Posted January 16, 2013 Report Share Posted January 16, 2013 So I got some Knauf Duct Board at a very good price. However, once I got it home it seems very...fibrous. I run my hand calmly over the fiberglass portion and it feels like i'm scraping off very small particles. Is this normal? It has the intent of being used as a return plenum so air flow shouldn't be TOO aggressive right? Is there some kind of guard that I could place over it to prevent that from entering the rest of the house if it is indeed a problem or perhaps a special air filter? Was considering lining it with Thermopan as I have some in my basement. Wise or no? If so should I just lay it over top or somehow seal it to the fiberglass portion? In the picture does this mean that the board was made November 16th 2000? Does the duct board look in good condition from the pics? Thanks a lot. Click to Enlarge 48.12 KB Click to Enlarge 89.44 KB Quote Link to comment Share on other sites More sharing options...
Marc Posted January 16, 2013 Report Share Posted January 16, 2013 Apart from the obvious damage and cut sheets, it looks fine. Those old styles of fiberglass duct board don't function as well as new product in regard to resistance to air flow, dust collection and mold resistance. Marc Quote Link to comment Share on other sites More sharing options...
mijotter Posted January 16, 2013 Author Report Share Posted January 16, 2013 Thank you. Yeah I know but it is what it is. I was wondering however if the lining that is used in Flex Duct, that thin black lining, is available to wrap the duct board in or another similar product or would Lining the fiberglass part with Thermopan be just fine... Quote Link to comment Share on other sites More sharing options...
John Kogel Posted January 16, 2013 Report Share Posted January 16, 2013 You could just paint the inside surface. But don't ask me. We use metal here, damp climate. Quote Link to comment Share on other sites More sharing options...
Marc Posted January 16, 2013 Report Share Posted January 16, 2013 I wouldn't line it. If you want to improve on it, buy a better product. Marc Quote Link to comment Share on other sites More sharing options...
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