acoustical duct wrap

acoustical duct wrap

PostBy: WNYRob On: Thu Feb 02, 2012 2:32 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.
WNYRob
 
Hot Air Coal Stoker Stove: Keystoker Koker controlled with CoalTrol

Re: acoustical duct wrap

PostBy: McGiever On: Thu Feb 02, 2012 4:35 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.
McGiever
 
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hot Air Coal Stoker Stove: HARMAN MAGNUM
Hand Fed Coal Stove: RADIANT HOME AIR BLAST
Baseburners & Antiques: OUR GLENWOOD 111 BASEBURNER "1908"
Coal Size/Type: PEA / ANTHRACITE, NUT-STOVE / ANTHRACITE
Other Heating: Ground Source Heat Pump
Stove/Furnace Make: Hydro Heat /Mega Tek

Re: acoustical duct wrap

PostBy: LsFarm On: Thu Feb 02, 2012 9:05 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
LsFarm
 
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland


Re: acoustical duct wrap

PostBy: 2001Sierra On: Thu Feb 02, 2012 9:46 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.
2001Sierra
 
Hot Air Coal Stoker Stove: Keystoker 90 Chimney vent
Coal Size/Type: Rice
Other Heating: Buderus Oil Boiler 3115-34
Stove/Furnace Model: Keystoker 90 Chimney Vent

Re: acoustical duct wrap

PostBy: stoker_RI On: Thu Feb 02, 2012 9:57 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 ....
stoker_RI
 
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: WL 110 Boiler

Re: acoustical duct wrap

PostBy: dave brode On: Fri Feb 03, 2012 10:53 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.

Dave
dave brode
 
Stoker Coal Boiler: Keystoker KAA-2
Hand Fed Coal Boiler: used to have a 5 section Red Square
Coal Size/Type: rice anthracite