making it an essential component for both air and water-source equipment

The integrated 24V solenoid provides reliable electronic actuation

Chatter is typically the result of low voltage from the transformer or a faulty thermostat

Frequent cycling or "tripping" is typically indicative of restricted airflow

Common Technician Questions Which Reznor models use the 257246 control board

Greenheck SP-B90 Ceiling Exhaust Fan 318423-701 making it an essential componentThe Greenheck SP B90 is a high performance ceiling exhaust fan engineered for continuous or intermittent ventilation in commercial and high end residential applications. Operating at 115V with a 1500 RPM motor, this unit delivers a nominal 90 CFM, making it an ideal bathroom exhaust fan for moisture control and air quality management. The low profile housing is constructed from heavy gauge galvanized steel, designed to fit into tight ceiling plenums