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My 3731FL was made in late March. I notice on my front unit, each return has 1 side blocked off with the metal tape. I want to say that on the ODS, it’s the forward facing side, and on the DS it’s the rear facing side of the returns that are blocked off on the front unit. I’ll have to check the rear unit, but is this the case for anyone else? Seems I read where someone mentioned each of their returns working both directions, and installing 8 pieces of pipe in the 4 returns, 1 facing each way. Maybe I misinterpreted?
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