Plenum Supplyunlined 19 3/8X19

Supplenum 11X20X36 W/R- 6Liner

Supplenum 11X23X36 W/R- 6Liner

Plenum Sup11 X 22-3/4 X 36 R8

Supplenm 11X22-3/4X36 W /R-6

11 X 22 3/4 Plen

Plenum R-8 Lined 11X22 3 /4X48

4 Ft R-6 Plenum

Supplenm 18-5/8X21-1/4X 36 Wr6

Plen Supunins 18-5/8X21-