13 x 24-1/2 x 24 in RA Plenum with 1 in Liner Cap 26 ga

16-1/2 x 24-1/2 x 24 in RA Plenum with 1 in Liner Cap 26 ga

Return Air Plenum, 1 in Lined, 23 x 20 x 24, 26 ga

Return Air Plenum, 19-3/4 x 20 x 24 in

Supply Air Plenum, 14-1/2 x 19-1/2 x 36 in, For GE 21 in Air Handler

Supply Air Plenum, 11-5/8 x 20 x 36 in, For GE Connect

Return Air Plenum, 19-1/4 x 21 x 24 in, For GE 21 in Air Handler

Supply Air Plenum, 13-1/2 x 11-1/8 x 36 in, For GE Small Packaged Unit

Return Air Plenum, 20 x 24-1/2 x 24 in, For RUUD 21 in Air Handler

Return Air Plenum, 23 x 20 x 24 in, For RUUD 24 in Air Handler