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How to place return grille in basement room

Viper98912

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Joined
Oct 20, 2012
Messages
1,139
Location
GA
Hello GJ'ers! :beer:

I'm currently crafting some plans to build a basic rec room in the basement. My home is a new build with 2 stories above ground and the basement below. The HVAC unit is placed in the basement, as well as all the main piping running left/right and then up the floor and walls of the house.

The basement is already plumbed with three air vents in the ceilings (between the beams). I mostly keep these closed since I'm not down there often (yet).

I plan on building a small rec room where one of the air vents is, so that covers air coming in. I plan on using one of the wall cavities between the studs (16") as the air return for the system to feed back into the open basement. I do not want to plumb directly into the return piping since it's only a foot away and would probably significantly disrupt the balance of the house.

I live in a northern climate, and in the main levels of the home all of the returns are placed high on the walls in the rooms (I assume this is to pull the hot air out and push cold air in). All of the air vents are placed in the floor.

So, inside of the new rec room, should I place the return grille near the floor, and on the basement side up high? Or reverse it, and put the return grille up high and the basement side down low? The reason I ask is because this is the basement and I'm guessing that it's going to traditionally be colder down there, so I would assume down low on the inside is better. Plus, the air vent is in the ceiling (on the other end of the room). Then again, this is opposite of what's upstairs.

Thanks for the help guys :thumbup:
 
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LS6 Tommy

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Dec 27, 2013
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Northern NJ
Does your furnace use outside air for combustion, or air from the basement? You can't share return and combustion air anymore.

Tommy
 
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V

Viper98912

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Oct 20, 2012
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1,139
Location
GA
Intake and exhaust are piped to the outside from the furnace.

Also, I have a long flex tube with a 90 deg bend to another outside wall that's just open to the basement; is this for some type of equalization of pressure?
 
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ripperd

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Jul 2, 2014
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Location
Twin Cities, MN
Intake and exhaust are piped to the outside from the furnace.

Also, I have a long flex tube with a 90 deg bend to another outside wall that's just open to the basement; is this for some type of equalization of pressure?

That would be for make-up air for bathroom vent fans, kitchen exhaust hood, and for your water heater if it is a gas unit that doesn't use outdoor air for combustion.
 

TractorJeff

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Dec 8, 2013
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3,309
Location
Elkhorn, WI
In my brothers finished basement (Wisconsin) the ducts blowing down to the floor level cold air returns while the upstairs ducts are as you describe.
 
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