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Old 01-14-2008, 03:36 PM   #1
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cold air return


on my cold air return duct, just before it heads thru the filter and into the furnace are two grilles. When the HVAC technicians installed the new ac, they said i should keep the grills open. Why? Is that only during the summer and not during the winter? The air is blowing out of the grills. is that normal?

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Old 01-14-2008, 03:40 PM   #2
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cold air return


The a/c needs more return air than you have ducted so they added the grilles in an effort to get more air back to the drive for cooling season, the last thing you want in heating mode is to pull air from around the furnace, that could cause combustion problems. The real solution is to add more returns to the system.

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Old 01-14-2008, 03:48 PM   #3
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cold air return


no the air is blowing out those grills not in.
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Old 01-14-2008, 03:51 PM   #4
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cold air return


Then it can't be on the return. You may feel air movement, try and cover them with a piece of paper and see if they blow or pull.
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Old 01-15-2008, 07:37 AM   #5
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cold air return


u are correct.. it was pulling the air in. So i should keep those vents open in the summer and closed in the winter?
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