Water to Air Heat Exchangers

WB-1618-4r38 Exchanger Size: 16" x 20 1/2" x 4" 4 row 3/8" tubing WB-1818-4r38 Exchanger Size: 18" x 20 1/2" x 4" WB-1920-4r38 Exchanger Size: 19" x 22 1/2" x 4" WB-2222-4r38 Exchanger Size: 22" x 24" x 4" WB-2424-4r38 Exchanger Size: 24" x 26 1/2