903404 HVAC Furnace Draft Inducer Motor Replacement M1 Combustion Blower Assembly Model Specific Not Universal. Please see Model Number fitment information at the bottom of this page before placing your order for this part. Alternate part numbers include SM3404 and 621787. Must match specs of current motor to function correctly. Popular models include for this motor include M1MB 056A BW, M1MB 070A BW, M1MB 077A BW, and M1MB 090A BW. Service Tip: It is recommended to the replace the draft inducer gasket seal, or seal with high temperature silicone sealant to prevent carbon monoxide from leaking into the home. Replacement parts are compatible with Major Brands, but you should always verify fitment with your specific application. SD products come in packaging.