Resideo 4074EZB Air Flow Switch 321894-708 The Honeywell 30755306-501 Relay is

The Honeywell 30755306-501 Relay is a specialized electro-mechanical relay engineered for precise switching within Honeywell UDC3200 and UDC2500 Universal Digital Controllers

Enhanced Safety: Features a built-in test button for verifying switch operation and circuit integrity during routine maintenance

the Zonefirst MMZ3 is the modern drop-in replacement tailored to match the footprint and basic terminal logic of the older CMM-3 series

This NEMA 48 frame blower motor is a direct drop-in for Lennox 78F9201

allowing it to function at 1/3 HP

Resideo 4074EZB Air Flow Switch 321894-708 The Honeywell 30755306-501 Relay isThe Resideo 4074EZB Air Flow Switch bag assembly is a critical field replacement component for maintaining the operational integrity of Honeywell Home electronic air cleaners. Engineered for specific compatibility with F300E, F50F, and AFS series units, this differential pressure switch ensures the air cleaner only energizes when sufficient airflow is detected within the ductwork. This prevents ozone buildup and protects internal components from dry