where precise draft inducer performance is required to satisfy pressure switch logic and ensure safe combustion gas venting

Never attempt to field-drill a carryover orifice

Whether you are performing a field conversion or replacing a fatigued part in a commercial gas train

7 Cv rating and precise linear or equal percentage flow profiles based on your specific media application

The S1-025-21710-701 typically functions as an automatic reset control

Lochinvar & A.O. Smith 100327064 Switch L99H008 where precise draft inducer performanceThe Lochinvar & A. O. Smith 100327064 Switch is a critical OEM replacement part designed for high performance commercial and residential heating systems. As a primary main power switch, this component ensures the safe manual isolation of the 120V circuit, allowing contractors to perform maintenance or diagnostic checks without fully depowering the mechanical room's sub panels. Engineered for seamless HVAC system integration, it maintains the