Is it alright for insulation to touch a heating duct?

vetting · 02-28-2009, 04:47 AM

I have an older furnace that pumps out really hot air. Is it ok for normal insulation to touch the duct work?

Just Bill · 02-28-2009, 07:13 AM

Depends on the insulation, but probably OK. Even really hot air will not be much over 100 deg, and most insulation is fire resistant. The plenum is usually the hottest spot, and you can usually even hold your hand on that.

**joasis** · 02-28-2009, 10:04 AM

Yes. Not even a problem.

Scuba_Dave · 02-28-2009, 10:09 AM

As long as its not the paper backing touching the vent

vetting · 02-28-2009, 10:22 AM

Its unfaced blue jeans insulation - it has a class A fire rating.

Here are some pictures of the kitchen remodel progress. The vent in question is the last photo. The insulation is stuffed up at the top. Most of the duct work is also wrapped with thin foam/foil. Best part is that since I put the insulation in, I cant hear the tenants conversations upstairs any more.

http://remodel.myauctionlinks.com/kitchen2.php

kenmac · 02-28-2009, 03:46 PM

Ok for the duct work. There are clearences for combustibles to close to the exhaust vent...of a gas appliance

02-28-2009, 04:47 AM	#1
vetting Member Join Date: Jan 2009 Posts: 56	Is it alright for insulation to touch a heating duct? I have an older furnace that pumps out really hot air. Is it ok for normal insulation to touch the duct work?

02-28-2009, 07:13 AM	#2
Just Bill Member Join Date: Dec 2008 Location: Wilmington, DE Posts: 3,098	Is it alright for insulation to touch a heating duct? Depends on the insulation, but probably OK. Even really hot air will not be much over 100 deg, and most insulation is fire resistant. The plenum is usually the hottest spot, and you can usually even hold your hand on that.

02-28-2009, 10:04 AM	#3
joasis General Contractor Join Date: May 2006 Posts: 868	Is it alright for insulation to touch a heating duct? Yes. Not even a problem. __________________ Ladwig Construction Hennessey, Oklahoma 405 853 1563

02-28-2009, 10:09 AM	#4
Scuba_Dave Xtreme DIY'r Join Date: Jan 2009 Location: South of Boston, MA Posts: 17,248	Is it alright for insulation to touch a heating duct? As long as its not the paper backing touching the vent

02-28-2009, 10:22 AM	#5
vetting Member Join Date: Jan 2009 Posts: 56	Is it alright for insulation to touch a heating duct? Its unfaced blue jeans insulation - it has a class A fire rating. Here are some pictures of the kitchen remodel progress. The vent in question is the last photo. The insulation is stuffed up at the top. Most of the duct work is also wrapped with thin foam/foil. Best part is that since I put the insulation in, I cant hear the tenants conversations upstairs any more. http://remodel.myauctionlinks.com/kitchen2.php Last edited by vetting; 02-28-2009 at 10:25 AM. Reason: forgot link

Is it alright for insulation to touch a heating duct?