When the Demand Cooling module detects discharge temperatures exceeding 292°F via the thermistor

This model utilizes a 1/8" NPT female air connection

Common Technician Questions Which Reznor models use the 257246 control board

fitting standard 2

The integrated 24V solenoid provides reliable electronic actuation

Greenheck SP-B90 Ceiling Exhaust Fan 318423-701 When the Demand Cooling moduleThe 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