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The included 2-wire ventilation damper uses a spring-return mechanism
This is a pilot-operated valve and requires a minimum pressure differential of 5 PSI to lift the diaphragm and maintain stable flow
Low Back Pressure Performance: Specifically tuned for freezing and deep-chill applications
2-way normally closed shutoff solution specifically engineered for low-pressure air-fuel gas applications
Key Benefits for Technicians: Precise Thermal Calibration: Fixed 150°F cut-out and 45°F reset differential ensures accurate furnace over-temperature protection
Greenheck SP-A390-QD Ceiling Exhaust Fan 30067439-890 The included 2-wire ventilation damperThe Greenheck SP A390 QD is a professional grade ceiling exhaust fan engineered for high performance air evacuation in commercial and multi family residential environments. This direct drive unit delivers a versatile airflow range of 279 to 410 CFM, making it a reliable solution for maintaining air quality in large restrooms and clean air applications. Constructed with a galvanized steel housing and lined with acoustic insulation, the SP A390 QD is