Why 3 Transfer Grilles on Furnace Room Wall. Also do I need a cold air return?

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Old 05-30-20, 10:30 AM
J
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Why 3 Transfer Grilles on Furnace Room Wall. Also do I need a cold air return?

Hi, I'm remodeling my basement and noticed the previous owner had 3 transfer grilles on the furnace room wall. I assume it's for better air flow to the furnace. But several years ago when I had a water heater replaced, they installed a duct leading from outside to the furnace room (I believe it's called a combustion air duct?). My question is whether these 3 transfer grilles are needed - 0,1, 2 or all 3? Also,the door for this furnace room is a bifold, so it does not seal the room off as much as a standard door.

I was also wondering if I need a cold air return in this basement. There are no doors - just an open stairway leading to the cold air return upstairs? I'm considering converting one of the transfer grille to a cold air return if needed - although hoping I don't need to do the extra work if not needed!
 
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Old 05-30-20, 10:41 AM
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If they installed a fresh air line in from outside you should be ok.

I see grills at the bottom of the wall and the top.
That was done to draw in cold air from the floor and allow hot air out at the top.
Natural convection.
 
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Old 07-10-20, 05:07 AM
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None of the return duct joints appear to be sealed. If they're not, that's a very unsafe condition, especially with an 80% furnace: You could be routinely circulating combustion products to your living space.
 
 

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