I think the a/C cold air return is the large square area where the filter is on the ceiling unit. The grills we have been talking about closing are on the periphery of the unit. The filter is in the center & that's the return.
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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