Open air returns in attic

Jimbellar | Posted in Energy Efficiency and Durability on July 20, 2016 12:32pm

I have two open air return in the attic. I’m wonder exactly what they are for?

Answer

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Martin Holladay | Jul 20, 2016 01:46pm | #1
Jim,
It's hard to say without investigation. Go up in the attic and shout (or sing) into the duct. Ask a family member to walk through the house and listen for your shout or singing, so you can figure out where the duct terminates.

I've heard of some builders pulling combustion air for a mechanical room from the attic. The duct simply terminates somewhere in the mechanical room -- at a grille or as an open duct -- to provide combustion air for a furnace, boiler, or water heater.
user-2310254 | Jul 20, 2016 02:24pm | #2
Do you have any rooms with huge dust bunnies? ;)