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The A.O. Smith 319143-443 is an indoor fan motor kit for A.O. Smith tankless water heaters. It is designated MOTOR, FAN, INDOOR and fits models ATI-110U, ATI-310U, ATI-510U, ATO-110U, ATO-310U, and ATO-510U. The manufacturer lists the part as discontinued (April 17, 2019) with Takagi part 100074606 shown as a direct replacement. The kit includes the fan motor only; gaskets and mounting screws are not included. Item weight: 2.6 lb.
Indoor fan motor kit for specified A.O. Smith tankless models; discontinued with direct replacement 100074606; fan motor only, no gaskets or screws; 2.6 lb
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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