Zero Minimum Differential: Reliable operation in gravity-fed or low-pressure systems with no minimum pressure requirement

20" PF rating ensures the furnace operates within the manufacturer's tight safety tolerances

while commonly used in natural gas boiler configurations

000 BTU on natural gas applications

It is an essential component for industrial refrigeration high pressure cutout applications where ammonia safety controls are non-negotiable

Lennox 21703 Wheel 30067439-890 Zero Minimum Differential: Reliable operationWhen you are dealing with a critical airflow issue in a high capacity system, the Lennox 21703 Blower Wheel is the direct OEM replacement fan wheel engineered to restore factory spec HVAC performance. This double inlet centrifugal wheel features a precise 12 5 8 inch diameter and 12 5 8 inch width, designed specifically for a 5 8 inch bore shaft. Constructed from heavy duty galvanized steel, this forward curved blower wheel is built to handle the