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Thanks. I've never had this in a house, and have lived in newer houses in the area. Think I could just disco that? We have plenty of doors opening all day, kids, and dog doors.

Hello. I moved into a house recently. The house was built about 15 years ago. The AC/furnace return shaft has two vents (main level and top level). This I understand. What I don't understand is why someone cut into the shaft and ran a 8" flex tube outside to a vent on the back of the house...