OB-4 water to air heat exchanger. 90,000 BTU, 18” x 16 1/4” x 3 1/2” sweat connections, 16” x 16” finned area
OB-4 water to air heat exchanger. 90,000 BTU, 18” x 16 1/4” x 3 1/2” sweat connections, 16” x 16” finned area