"thumping" noises during startup

ensuring seamless integration into existing control sequences for air handling units and exhaust systems

The 304-grade stainless steel construction provides superior resistance to thermal fatigue and corrosive flue gas condensates compared to standard cold-rolled steel

It can also be used to manually adjust the valve or shut it off completely before the thermostatic operator is installed

audible air leaks at the actuator housing

Reznor 41004 Fan Blade Els PW 17895 "thumping" noises during startupThe Reznor 41004 Fan Blade is a precision engineered OEM replacement part designed for high static efficiency in commercial and industrial unit heaters. Featuring a 14 inch diameter and a 31 degree pitch, this 4 blade fan is optimized for maximum CFM output while maintaining structural integrity under continuous operation. The component utilizes a 1 2 inch bore and is configured for clockwise (CW) rotation, ensuring drop in compatibility with