or a restricted chimney/vent pipe that is forcing flames to "roll out" toward the switch

it addresses the common failure point of degraded BUNA N paddles and weakened spring return valve seals

Built as a definite purpose contactor

facilitating precision movement in multi-blade damper configurations

The Heil Quaker ICP 1171449 Flame Sensor is a critical OEM replacement component designed for high-performance flame rectification in International Comfort Products (ICP) residential and commercial heating units

System Sensor APA151 Annunciator or a restricted chimney/vent pipeThe System Sensor APA151 is a critical remote annunciator with piezo alert designed for HVAC duct smoke detection systems. Engineered to meet NFPA 90A requirements, this accessory provides both audible and visual notification for 4 wire conventional duct smoke detectors when a system control panel is not present. Operating at 24 VDC (nominal range 16 to 33 VDC), the APA151 features a high visibility red alarm LED and a green power LED to ensure