Interested to note (for me at least), Thor tells me that this is the ADB that should have been installed on my upgraded Mach 15. It’s designed to provide the return as well as a vent that can be opened to provide a straight shot of cold air out the bottom of the unit. When closed it directs air back into the ducted system. The Dometic ADB currently installed in my system may have been an attempt to provide the same option..Will open it up a d see what’s going on in there before buying the return only grill. However, since my setup has nothing to do with Thor, I realize my results have no real value to others here.
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Rod
1998 Winnebago Chieftain - sold
2012 Tiffin 36LA - Sold
2015 Thor Vegas 24.1
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