Can the Hartzel fan 31-36-5 be used to exhaust moist air from a wash booth? Can it be installed outside?

Yes, it can be used to remove moisture (steam) from a wash booth. If being installed outdoors, it's recommended to use the outlet guard and weather cover as well, which are available to be purchased as accessories. For more assistance, please give us a call at 1-888-295-2009.