Fans have an external design and are mounted on roofs of flat and inclined type only in horizontal position, so that the axis of rotation of the motor was in vertical position. Due to the fact that the fan motor is removed from the flow of transferred air, the maximum temperature of the air flow can reach 80°C.
Basically the case is made of galvanized steel sheet. Statically and dynamically balanced impeller with backward curved blades. The fan has a standard induction motor and protection class not lower than IP 54.