3 SQ. FT. SPIRAL HEAT EXCHANGERStock Number: G-1871Mfg. American Heat Reclaming Corp.Type 1-H, no. 15214, 1982, NB 11881shell = 304 stainless steel, hd = SA515-70rated for 75 psi @ 200 F(4)3 inch in and out, (2)1 inch drains(1) available Posted in Heating and Cooling.