Hoffman 401429

74, ½” x ¾” Straight Steam Unit Heater Air Valve

Steam Unit Heater Air Valve

• Float-type thermostatic vent
• Single non-adjustable port
• 1⁄2” NPT female and 3⁄4” NPT male straight shank
• Install 6-10” (150-250mm) above horizontal return

and 18” (450mm) above the boiler water line * Maximum operating pressure 35 psig (2.4 bar)*(Drop away pressure - maximum pressure against which the vent

can open). * Maximum pressure 35 psig (2.4 bar)