Author Topic: air travel noise in exhause duct  (Read 6002 times)

shawn1974hk

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air travel noise in exhause duct
« on: November 11, 2010, 04:00:37 PM »
there is a 18x 25 exhaust grease duct in the center of the dinner area in the resturant i work , when the exhaust on , a mass amount of air travel through the duct and it make alot of noise , what is the best way to sound proof , can i use glue sound board to it then another layer of quikrock or i have to build a sofit then soundboard with quikrock , please help .
shawn

Randy S

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Re: air travel noise in exhause duct
« Reply #1 on: December 02, 2010, 12:40:23 AM »
you can wrap the outside of the duct with our 1" foam mat w/psa backing as long as the temp. of the duct does not exceed 200 degrees.
Randy Sieg

Super Soundproofing Co
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art noxon

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Re: air travel noise in exhause duct
« Reply #2 on: December 07, 2014, 02:06:50 AM »
Sounds like this duct is critical to the operation of the restaurant.  Is it a duct that carries greasy air from a stove? 

The noise from the duct comes from the air opening, not the walls of the duct, correct? 
If so, the odds are high that adding something to the walls of the duct won't change the noise of the air flow. 

If grease laden air flows into this duct, adding sound absorbing panels inside the duct isn't a good idea because they will saturate with grease.  Changes the fire load in the duct and may be against the law. 

Add a plate that hangs down in front of the air inlet and put removable/throw away sound panels to the top and bottom of the plate.  Make the plate larger than the air duct by about 1 foot on each side.  Make sure the perimeter air inlet in square inches is larger than the inlet area of the air duct.  Also make sure the plate can't get sucked into the air duct and plug up the system.  Throw the sound panels away every once in a while as they get loaded up with grease. 

Don't you have an acoustic engineer in your neighborhood to call?

Art Noxon, Acoustic Engineer
Pres of ASC - TubeTrap/WallDamp

 

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