Universal Cold Air Return/Filter Box

The Universal Cold Air Return/Filter Box Provides a means of keeping any foreign materials or objects from getting into the blower housing and damaging it. It also provides a convenient manner in which to filter the system air as well as connecting a cold air return duct which is a MUST in any good installation. It fits models 1300, 1400, 1537G, 1537M, 1602R, 1602M, 1802G, 1557M, 24A, 24AF, and 30A. The filter size on the Cold Air Return measures 16" x 20" x 1". The attaching duct system size is 13" x 18".