![]() ![]() This is the original unit in the home, original, builders installation. This is the only filter for the entire home, the filter in the unit. I also checked my whole home unit (12 years old) and it takes a 16x21" filter in the unit (336 sq in - 3 ton unit). My 2 ton unit for the basement takes a 14x20" filter in the unit. If you have any problems with the registration process or your account login, please contact support. We suggest not registering using an AT&T, BellSouth, AOL or Yahoo email address.
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