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"Why would you want to use this stuff, Sheetmetal is permanent and it can be cleaned, it doesn't blow out glass fibres that can cause cancer either, (read the box)."
Because it is half the price of sheet metal. Most GC's here tend to go with the low bidder when choosing HVAC subs, I'm sure it is like that in most areas as well. Besides, ductboard if installed and sealed properly will not have loose fibers blowing off, and will last for many many years as long as it doesn't get crawled on. Also, you can seal a ductboard duct system 100%, something you can't do with sheet metal.
A duct system should never need to be cleaned if properly installed, sealed and GOOD filtration is used from the beginning, but ductboard CAN indeed be cleaned effectively using the correct methods.
As far as which brand, I don't think it matters much for regular ductboard, they all have to adhere to the same standards. We seem to get alot of the Certanteed stuff from my suppliers here, but occasionally we get owens corning...I don't see a differance. Now, if you get into coated or anti-microbial ductboard, Knuaff is the way to go, but that stuff is very expensive.
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