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Old 11-18-2013, 09:25 AM
Bob338 Bob338 is offline
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Join Date: Feb 2011
Location: Redding, California
Posts: 229
Originally Posted by vstech View Post
IIRC, the center is for a/c only, or possibly just for outside air, close the center flap in heating season...

The center vents ARE for outside air. Or for AC when the AC or snowflake buttons on the control unit are depressed. For all other functions they should be closed.
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