Lennox 21Z11 Smoke Detector kit 340155-7026 professionally recognized as the 40XL-7-150

professionally recognized as the 40XL-7-150 or LF40XL7-150-1

or freeze protection circuits

making it suitable for systems utilizing electric heat strips as auxiliary or emergency heat sources

Modular Design: The PopTop actuator connection allows for quick-release servicing without breaking pipe seals

Lennox 21Z11 Smoke Detector kit 340155-7026 professionally recognized as the 40XL-7-150The Lennox 21Z11 is a professional grade duct smoke detector kit engineered for seamless integration with commercial and light commercial air handling units. This HVAC smoke detection kit is critical for life safety compliance, providing rapid identification of combustion particulates within the supply or return air streams. Designed specifically for Lennox equipment, the 21Z11 interfaces directly with HVAC safety circuits and system control boards to