Used APV 79 Sq.Ft. (APPROX.) Paraflow plate heat exchanger. Model SR2 M-12. National Board#13055. Chamber 1 and 2 MAX Allowable working pressure 150 PSI @ 300°F. Chamber 1 and 2 MID. Design Metal Temperature -20°F @ 150 PSI. Test Pressure 195 PSI. Operating Temp. Max/Min 300°F/32°F. Platage DIM (L) Max/Min 7-15/16” / 7-13/16”. Platage DIM Eased On: QTY/THK 42 /0.6mm. The heat exchanger has two stages, 42 Plates that measure 32" x 12". One side has four-2 1/4" connection ports, the other side has two 2-1/4” connection ports. Serial # G2011001076. Built 2012. Overall size is 46”L x 15"W 44”H.