Always verify secondary transformer or line voltage before installation

ensuring maximum heat exchange efficiency and system performance

Because it uses a linear 4-20mA humidity output

reducing pressure drop and simplifying installation in tight mechanical runs

replacing a faulty digital heater circuit board with this genuine component restores the unit to factory specs

Lennox 51W11 Vent Kit 320720-756 Always verify secondary transformer orThe Lennox 51W11 Vent Kit (OEM part 605384 01) is a professional grade flush mount vent termination kit designed to isolate intake and exhaust lines for high efficiency gas furnaces. As a veteran preferred solution for achieving a clean, low profile exterior finish, this kit is compatible with 2 inch, 2. 5 inch, and 3 inch PVC pipe. It is specifically engineered for Lennox high efficiency condensing units, ensuring proper airflow dynamics while