Apart from panel fans and duct fans, many industrial fan manufacturers also have roof exhausters or roof ventilators on their product list. Roof exhausters are special industrial appliances that are installed on the roof to suck air vertically from the industrial environment below.
Fan manufacturers take in account the various factors that impact the functioning of the roof exhausters such as the location where it is installed, the capacity to expel the acrid fumes or gases and the capacity to withstand the chemical reactivity of the discharged gases.
You will find that good fan manufacturers see that the roof exhausters have a rust proof body and to that both the fan and the covering are covered with rust proof enamel paint. These roof exhauster fans have nylon long lasting bearings and other material that withstands heat and moisture. Different kinds of motors are used in these roof exhausters by fan manufacturers for different requirements of the industrial processes where the roof exhausters need to be used.
Some roof exhausters are also custom-made by fan manufacturers for specific needs that are not satisfied by the general use appliances in the market. These roof exhausters can have motors that can withstand high temperatures on the roof top and also rust proof as it can be rainy and moist on the roof-top or it can have high moisture content in the gases that have to be expelled. Leakage has also to be prevented as there can be short-circuit if water enters the fan assembly.
The external features of the roof exhausters have also to be taken care of by the fan manufacturers. The fan drum has to be welded to the curb cap so that there is no leakage from the edges. Fan manufacturers also have to seal the fan belt in an air-tight tube so that these parts are protected from the acrid gases that are being expelled. Just like any other industrial fans such as panel fans or duct fans, that have to be used in an industrial environment, roof exhausters are of robust construction so that they are long lasting and can withstand the vagaries of nature as well as the harsh influence of acrid gases that it can come in contact with for long hours.
Industrial fan manufacturers are thus more concerned with the functionality of their products rather than their appearances. Although too much effort is not made on the appearance, full effort is put into the optimum construction standards.
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Scott Rice

Americraft Manufacturing Company Incorporated
P.O. Box 1108
Mason, Ohio 45040
800-848-2938