10-inch barometric draft control designed for precise regulation on commercial and large residential appliances

or differential air pressure across filters and coils

eliminating the calibration drift common in aging mechanical thermostatic valves

or Comfortmaker units

Browning 2VP75X 1 3/8 Sheave 320819-301 10-inch barometric draft control designedThe Browning 2VP75X 1 3 8 Sheave is a heavy duty, two groove variable pitch component engineered for high demand HVACR and industrial blower applications. Constructed from durable cast iron, this 7. 50" Outside Diameter sheave features a 1 3 8" fixed bore designed for direct mounting on motor or drive shafts. This variable pitch sheave allows technicians to fine tune drive speeds and airflow without replacing pulleys, supporting a versatile pitch