Acoustical Duct Wrap

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Posts: 264
Joined: Thu. Apr. 14, 2011 12:13 pm
Hot Air Coal Stoker Stove: Keystoker Koker controlled with CoalTrol
Location: Springville, NY

Post Thu. Feb. 02, 2012 1:32 pm

Has anyone ever used acoustical duct wrap on their air ducts. It is either bonded fiberglass or cotton with a foil face and you adhere it to the inside of your ducts. It is supposed to help absorb some of the noise created by convection blowers.

Currently I just have 10 and 8" ducts coming directly off my koker. I think next season I will install a plenum on top and run rectangular ducts to my existing forced air system and the plenum will make it easy to install the wrap before it is put together.

Just wondering if the wrap makes that much difference on the blower noise coming through the ducts nearest the stove.

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Post Thu. Feb. 02, 2012 3:35 pm

Bonded fiberglass would be superior to the foil faced, since the noise to be damped is traveling within.

Also, flexible boot collars between plenum and duct work would be very beneficial to isolate conduction of sound/vibrations that even acoustical materials would not completely dampen.

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Post Thu. Feb. 02, 2012 8:05 pm

PM Sting with this question, he works in the HVAC industry and probably has first hand info on the effectiveness of the different products and isolation devices.

Greg L
Burning Pea/Buckwheat through an antique stoker [semi retired SSboiler],
Running an Axeman-Anderson 260M boiler burning Pea, About 150-250#per day
Farming, Fixing, Fabricating and Flying: 'spare time' what's that?

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Post Thu. Feb. 02, 2012 8:46 pm

McGiever wrote:Flexible boot collars between plenum and duct work would be very beneficial to isolate conduction of sound/vibrations that even acoustical materials would not completely dampen.
I agree wtih McGiever on the value of the flexible boot collars, I use them and they knock the noise transfer down some.

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Post Thu. Feb. 02, 2012 8:57 pm

LsFarm wrote:PM Sting with this question
oops!....don't suggest that, greg ....Sting has his armour up! He doesn't accept pm's ....

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dave brode
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Location: Frostburg, Maryland [western]

Post Fri. Feb. 03, 2012 9:53 pm

Duct 'liner" goes inside, wrap goes outside.

My house duct trunk lines have sound liner. The old style black fiberglass. System is VERY quiet. I can't imagine that the foil faced stuff would absorb much. I work in the trade, but I've never seen anything with a foil lining for inside.

Like others said, even a short section of 'flex" on the branch lines helps a bunch. I used 12" of flex on each branch. Flexible connections [old guys call them canvas connections] on the unit itself help a bunch too, both supply and return.

I love my Kaa-2. It replaced a small 5 section Red Square, and Iron Fireman, burned bituminous for 20 yr.

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