Kitchen exhaust fan motors can be found online at Amazon, John Stone Supply and Repair Clinic, as well as at plumbing or brick and mortar electrical supply stores such as Grainger.
When buying an exhaust fan motor, it is important to consider the dimensions of the fan being turned by the motor, along with the amount of air that is to be displaced. Sizing the wrong motor for a fan can result in damage to the motor, fan and electrical system in the home.
Kitchen exhaust fans and fan motors are rotating electrical devices. Caution should be observed anytime electrical work is being down in a home. Consult a professional electrician for assistance in wiring the motor to a house electrical system.