Siemens Building Technology QFM81.21 Hygrostat 340793-762 Technicians must use a 1-5/8"

Technicians must use a 1-5/8" hex thin-wall socket to avoid damaging the orifice or regulator body during replacement

this HVAC blower motor bearing is rated for high radial load capacities

4" pitch diameter for B-belts

Robust Construction: The steel shell and factory-sealed ODF connections ensure a leak-free

Utilizing the Rheem replacement parts catalog ensures compatibility with specific furnace series

Siemens Building Technology QFM81.21 Hygrostat 340793-762 Technicians must use a 1-5/8"The Siemens Building Technology QFM81. 21 is a commercial grade duct hygrostat designed for precision relative humidity control in HVAC systems. Engineered for both monitoring and regulation, this device features a stabilized sensing strip that ensures superior linearity and long term stability, even in high humidity environments or air contaminated with dust. Unlike baseline models, the QFM81. 21 utilizes an internal setpoint adjuster to prevent