Rheem-Ruud 70-22165-81 Draft Blower Freon while the 37K6301 is often

while the 37K6301 is often used for individual retail packaging

Industrial Build Quality: Built for proportional control accuracy within 3 to 15 psig signal ranges

Can this damper be used with round ductwork

As the direct replacement for RCC-1108

Rheem-Ruud 70-22165-81 Draft Blower Freon while the 37K6301 is oftenThe Rheem Ruud 70 22165 81 Draft Blower is a precision engineered 120V induced draft motor designed for high efficiency gas furnaces. This centrifugal blower assembly plays a critical role in the combustion process by exhausting flue gases and ensuring the pressure switch closes to initiate the ignition sequence. Featuring a durable shaded pole motor design, the 70 22165 81 induction fan is built to withstand high static pressure and heat cycles