As a type of exhaust fan, roof fans are often installed on rooftops for factory roof ventilation. The rain cap of the roof fan can effectively prevent rain and snow, and is only used for systems with high exhaust resistance. For the appearance of roof fans, there are rainproof measures. We set the roof fans in the shape of umbrella shaped or conical, or hemispherical rainproof caps. The conical and hemispherical rainproof caps are mainly used for exhaust above, the umbrella shaped rainproof cap is mainly used for exhaust below, and the cylindrical rainproof cap can be used for exhaust above and below.

From the perspective of air diffusion performance and its impact on the surrounding environment, roof fans with rain caps mainly used for exhaust can blow polluted air into the sky, which is very beneficial for better diffusion of exhaust gases. Especially in the case of roof supply fans near the roof fan, this characteristic is particularly obvious, which can reduce the interference of exhaust on the supply air. Therefore, the exhaust performance of roof fans is very excellent.

In terms of the material of roof fans, there is still room for development. Generally, the materials used for roof fans have strong anti rust ability, which can ensure the service life of the fans and prevent premature aging. The selection of rooftop fans should be based on the actual production situation, such as the size of the factory and the required ventilation volume.