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Air return makes too much noise, what should I do?

21598 Views 15 Replies 4 Participants Last post by  bigburb
I have a 4 ton AC system with 2 16x25 returns. One is located directly under the AC and is attached to the plenum, the other is located about 15 feet away and is attached via about a 10" duct. The closer one makes a lot of noise and catches most of the dust... the farther one has hardly any suction (I can usually go about 6 months b/t filter changes). I know I need to get more filter area somehow, I had three theories on what to do, but would like input:

1. Enlarge the current opening to 16x32, this would yield 175 sq in more intake space.
2. The chase directly under the plenum is on a hallway corner, I could install another 12x24 return grill on the adjacent wall that would yield 288 sq in. However I wasn't sure if it would be "aesthetically pleasing" to have a return on either side of a corner.
3. I can enlarge the return duct from the furthest chase to 12", I'm not sure if this would have enough effect to make a difference though.
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block off the one under the unit by half so it starts to pull that 15" run back the furnace in a louvered door room or 100% open that 15 run seems more the true house return.if you want to go with 4" filter to catch the dust it can be done you can go with a 2" pleated 1" pleated also check out local Grainger supply they welcome home owners...the unit is basically pulling the most air from the nearest source as it should and the filter differece is the proff:whistling2:
which return is the thermostat nearest to shold be nose hi right above the return or in the general area.when you set temps its the return that satisfies the stat not the discharge on the supply grills...but that return pulling over it:wink:.maybe consider half on both for a true'r return...just do one test at a time to see the differences:thumbsup:
OK thats makes it easy block the 15' run for total air pulling over that sta for a true setpoint cycle.would you say the hallway is more a common area then that 15' return grill location if so..i could suggest relocate the stat to nose(average 6' person) hi over that 15' return grill but thats too much seems the 15' is useless except for holding spare filters i'm not crazy about 4' filters in residential 1 or 2 is cool if dust and allergies are a problem..monkey with it lets here back:wink:
1 - 3 of 16 Posts
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