Check for a dirty 4-inch pleated filter

This HVAC furnace control board is compatible with 100% shutoff systems using Natural or LP gas and includes an integrated damper connection with an automatic vent damper plug

A functioning furnace limit switch should show continuity (0 ohms)

Rugged Solid-State Construction: Resistant to the vibration and high ambient temperatures common in industrial HVAC environments

Greenheck 304843 Motor 340155-7026 Check for a dirty 4-inchFor industrial ventilation applications, the Greenheck 304843 Motor is a robust direct drive replacement motor designed for continuous duty in exhaust fan systems. This 115V single phase motor operates at a nominal 1050 RPM and provides 22W output (equivalent to approximately 1 29 HP). Engineered as a shaded pole motor with Class B insulation, it is built to handle the thermal demands of HVAC ventilation units like the Greenheck SP 226 and SP A290.