300mm axial fan with automatic shutters suitable for panel/wall mounting or window mounting using the appropriate window accessory kit. Suitable for commercial applications in pubs, hotels, restaurants, offices, schools, shops and factories.   Key Features Suitable for panel/wall mounting or window mounting with appropriate window accessory kit Simple installation External 2 speed reversible on/off controller available Manufactured impact resistant high gloss ABS for strength and durability Motor fitted with thermal over load protection Please note the frame of this fan is 400m. It is the size of the spigot of the fan itself behind the frame which is 300mm.