These units are functionally identical

The Lennox 51W15 Interlock Switch serves as a fundamental safety component within residential and commercial furnace and air handler cabinets

temperature curve for this sensor

this compressor hard start kit is easy to install and integrates directly into existing systems

Zonefirst SPRD-8 Damper Els PW 17895 These units are functionally identicalThe Zonefirst SPRD 8 8" Round Barometric Static Pressure Regulating Damper is a critical component for maintaining system bypass airflow and duct integrity in multi zone HVAC residential and light commercial applications. Constructed from 22 gauge galvanized steel, this barometric relief damper features a single blade, counter balanced weighted arm designed to respond automatically to fluctuating static pressure. As zone dampers close, the SPRD 8