Manufactured by Graham Manufacturing Co., Inc. Model 20xf-14l. Serial no. 97-31390-2. Cast iron housing. Shell test 150 psig. Tubes test 350 psig.
Heflow cut sheet and bulletin, the 20XF-14L model Heliflow has:
20 Coils
19.4 sq. ft. surface area
3/8" tube diameter
1/8" coil spacing
9.90' coil length
X = Cast iron casing
F = Copper tubes
14L = casing size designation
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