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The Allanson 421-664 ignition transformer is a critical replacement component engineered specifically for Webster Engineering burners
Universal Compatibility: Fully identical to the 40003916-521/U model
Whether you are performing a scheduled overhaul or addressing a cracked housing on a Watts BKF55B
you would typically look for the NC/S versions or a 4-wire variant
Direct Compatibility: Designed for an exact fit in York furnace parts assemblies
System Sensor D4120W Detector Freon The Allanson 421-664 ignition transformerThe System Sensor D4120W is a high performance 4 wire photoelectric duct smoke detector specifically engineered for harsh environments and outdoor rooftop HVAC installations. This air duct smoke detector features a NEMA 4 watertight enclosure, providing superior protection against windblown dust, rain, and splashing water. Utilizing integrated low flow technology, the unit operates efficiently in airflow speeds ranging from 100 to 4,000 feet per