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Thanks that is what I am afraid of only have 3 1/2 inches from front of vent hole in ceiling to the ceiling air duct already there.. What did they do in 2008 to add a 2nd air. I am wired to do it ... Confused

We have a Bighorn 3100RL have finally decided to put in a 2nd non ducted ac in the bedroom. The ceiling air duct is so close to the roof vent opening I don't know if the Penguin II air distribution box will cover the vent. No dimensions for the Dometic ADB is listed anywhere. We are wired and...