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Old 06-25-2010, 12:16 PM   #1
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Return Vent Issue


Hello!

Is there a rule as to how large your return should be? The attached photo shows how the air-handler and return was done. The unit sits in this closet and has no duct work on the return side. When I moved in the only return was the one with red arrow. I recently added the one with blue arrow. Due to this design there is an accumulation of warm air near the second floor ceiling which has now forced me to put in and run two ceiling fans constantly.

I want to make sure I have optimal air flow. Air handler is a Goodman model ARUF042-00A-1A and a 3 ton heat pump. Ducts are most likely standard, but are all within walls.
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Old 06-25-2010, 04:29 PM   #2
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How big are yours?

What air filter are you using. Was your indoor coil cleaned recently.

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Old 06-25-2010, 07:20 PM   #3
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Original (Red Arrow) 10" x 24"
My additional (Blue Arrow) 6" x 12"

If negative pressure when opening door is any indication it isn't enough.

3M filtrete? and coil has been cleaned.
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Old 06-25-2010, 07:27 PM   #4
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the return should be the size of the filter opening...if you crack that door do you feel bigtime ait returning to the unit?if so the uint is starved for air..nice door but that is where the return grill should be
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Old 06-25-2010, 07:36 PM   #5
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Quote:
Originally Posted by biggles View Post
the return should be the size of the filter opening...if you crack that door do you feel bigtime ait returning to the unit?if so the uint is starved for air..nice door but that is where the return grill should be
Yikes! that's a solid Oak door! If I leave the door cracked any less than 8" it slams shut! I know it's starved just needed help figuring out how much more of an opening do I need to create? Filter is 22" x 24" So I am short 216 sq. in.

THANKS!!!
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Old 06-25-2010, 07:50 PM   #6
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Stop using those 3M filters. Use a standard fiberglass filter. And you should see much better air flow.

The side wall you installed, is small for the amount of air you need to make up for.

Install a Hart & Cooley #650 24X8 grille. You'll need to make the hole bigger.
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Old 06-25-2010, 08:22 PM   #7
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Quote:
Originally Posted by beenthere View Post
Stop using those 3M filters. Use a standard fiberglass filter. And you should see much better air flow.

The side wall you installed, is small for the amount of air you need to make up for.

Install a Hart & Cooley #650 24X8 grille. You'll need to make the hole bigger.
Thanks! If I bump it up to a 36x8 that would be equal to filter size in combination with one in floor/ceiling.

So is the reduction in allergens all hype?
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Old 06-25-2010, 08:25 PM   #8
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A 36X8 return grille isn't as full 288 sq in opening. At best its 230.

If you want allergen control. Then you need to use a 4" or larger media air filter. In order to maintain proper air flow. 1" filters are too resistive.

You would need to have a cabinet installed for the media air filter.
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Old 06-25-2010, 08:34 PM   #9
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Quote:
Originally Posted by beenthere View Post
A 36X8 return grille isn't as full 288 sq in opening. At best its 230.

If you want allergen control. Then you need to use a 4" or larger media air filter. In order to maintain proper air flow. 1" filters are too resistive.

You would need to have a cabinet installed for the media air filter.
I'm sorry I have a 4x22x24 filter. 3M brand I thought it was called Filtrete or something like that.
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Old 06-25-2010, 09:12 PM   #10
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Get a different media for it. Such as Honeywell. they are lower in PD, and will let it move more air.

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