Replies

1. 
   Guest_ | Aug 01, 1999 09:19am | #1

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   Wait -- is ductboard used as the duct itself? I thought it was just insulation taped to the outside of a steel duct. If not, double yuck. You're supposed to wear a mask to avoid "irritation" while installing fiberglass -- who would want continual "irritation" from a shedding duct? Plus it would be impossible to clean.

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   Guest_ | Aug 01, 1999 09:38am | #2

   *I've seen HVAC contractors use duct board in lots of cases where regular duct won't work. A lot of times we will build returns or supplies into cabinetry or beams to hide the fact that duct work is in the room. I've never known anyone to have a health problem because of it, nor have I seen any warnings against it.It seems like a good product to me.Ed. Williams

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   Guest_ | Aug 02, 1999 05:14am | #3

   *A top notch sheet metal duct job, using rectangular duct, is internally insulated with a material with fibers similar to ductboard. Almost all residential work in my area (louisiana) involves ductboard plenums with flex duct. Very few people use sheet metal anymore here on residential work. Sheet metal ductwork that is externally insulated usually results in inslation falling off over time. Internally insulated rectangular ductwork has problems collecting dust, etc just as ductboard. I say ductboard is ok provided it is in a concealed and protected area. Both sheetmetal and ductboard should be sealed with mastic at take offs and joints to stop leakage.

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   Guest_ | Aug 02, 1999 08:03am | #5

   *We have the sheet metal + ductboard outside setup mentioned, with some asbestos tape thrown in for the heck of it. From the quotes I've gotten for an A/C replacement, I must say that the sheet metal work to, say, rework the plenum, is QUITE expensive. Another reason I'd probably be looking at hydronic heat for a new building...

2. 
   Scott_Day | Aug 02, 1999 08:03am | #4

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   My HVAC Contractor wants to use an Owens-Corning fiberglass faced board with foil facng on the other side to construct the duct runs. Will this product deteriorate? Seems that I heard or read something a while back that there may be concern using this product.
   What else should I be concerned about?