Which valve should be opened first during a system startup

The opaque black finish offers superior UV resistance

the RFS-4001 must be installed with the diaphragm in a vertical plane to maintain accuracy

As an in-line pneumatic relay

OEM design eliminates the need for field-fabricated drainage solutions

Nordyne 903404 Blower Assembly Els PW 17895 Which valve should be openedThe Nordyne 903404 Blower Assembly is a crucial induced draft component engineered for Nortek, Miller, and Intertherm M1 Series furnaces. As a veteran grade OEM furnace combustion motor, this assembly is designed to pull precise volumes of air into the combustion chamber, ensuring correct fuel to oxygen ratios for high efficiency heating performance. This specific induced draft blower is a direct replacement for Partners Choice 903404 and the older