Mayfair radial flow design uses a squirrel cage type blower wheel to produce a substantial output at relatively low RPM's. Low noise level make Mayfair blowers excellent for use in heads & galleys. Massive 3" diameter motor idles at 3100 RPM's assuring long life. Housings are molded of tough glass filled composite resin. Flange Mount #54124 - Convention-al design outlet flange to mount directly to the exhaust opening in the hull. Molded mounting brackets simplify installations. 112 CFM.