The centrifugal fans feature a steel casing made of galvanized steel. They are designed for ventilation supply and exhaust systems. They include a waterproof terminal box. They operate in supply or exhaust mode, depending on their installation within the ventilation system. They are suitable for installation in ducts with the corresponding diameter. They can be installed at any point in the ventilation system and at any angle. Equipped with an external rotor single-phase motor with bearing and a central backward-curved impeller. They have overheating protection with automatic restart. They can be mounted on walls and ceilings using special mounting brackets. The MARS GDF 200 / 250 / 315 models have steel blades. The ingress protection rating for the electrical equipment is IPX4, and for the motor - IP44.