Heavy-duty blowers use a “squirrel cage” type blower wheel to produce a substantial output at relatively low rpm’s. Lowest noise levels on the market make it ideal for heads and galleys as well as engine compartments. Long life is assured by the massive 3″ diameter motor virtually idles at 3100 rpm’s. Tough molded housing shrugs off shock and vibration. Designed to mount directly to exhaust opening in the hull.