Aprilaire 4237 Motor Aprilaire aa-4237 120V fan motor for 4237 Series 700, 760 and 768. Motor body measures 3-3/8" Diameter x 33/4". rating: 115V, 0.7 amp, 60 hz. Drive shaft is 1/4" diameter. The two wires are 7" long with a 3/16" female spade terminal Genuine Aprilaire #4237 fan motor for use in Aprilaire models 760, 768, 700. Will not work in the 700a or700 models that are molded in the grey (not tan) casing The Aprilaire humidifier fan motor part Number 4237is the replacement motor for aprilairemodels 760, 760a, 768 and 700 humidifiers