Basics of Indoor Air Quality

HeatingHelp · February 6

Basics of Indoor Air Quality

We of the Hydronic Realm often don't think too much about Indoor Air Quality, but that mindset is obsolete. We need to look at the Big Picture, not just the heating system.

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BradHotNCold · February 6

Recently moved into a condo (built about 1970’s) with HVAC system. During recent routine housecleaning, we vacuumed the cold air return cover. Vacuum pulled lot of dust, dirt, etc. So I said let me pull the cover off and give it a more thorough cleaning.

To my surprise, I discovered the ductwork was insulated on the inside with about a 1/2” of what resembled fiberglass, but it was more like black rock wool glued to a cloth (?) layer against the wall of the ductwork. Could this be asbestos? If not, is this a usual practice to insulate the interior of HVAC ducts?

Thanks for any suggestions/advice!

BradHotNCold · February 9

Any comments? I searched and my post showed up as “Closed” with comments but I cannot find the comments?

Larry Weingarten · February 9

Hi, I searched "interior duct insulation" and found both black and grey sheet insulation used for this purpose. It seems to be fiberglass.

Yours, Larry

BradHotNCold · February 9

https://forum.heatinghelp.com/profile/Larry%20Weingarten

Thanks, but it seems friable so that can’t be good! Guess we will call HVAC SERVICE!

Larry Weingarten · February 10

Hi @BradHotNCold , Here's a short description of this type of insulation. Installed right, there should be very little fiberglass available to the air-stream. 😊. https://rezcor.com/product/95198/Johns-Manville-Duct-Board-1x48x120-R-4-Fiberglass

Yours, Larry

Basics of Indoor Air Quality

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