The Kair Gravity Grille is a 125mm / 5 inch air exhaust outlet with a round spigot and non-return shutter flaps that automatically close when not in use to prevent unpleasant odours, noises, or draughts from flowing back into your property. The 5 inch / 125mm round male spigot on the back of the grille fits inside most comparable size pipes/hoses. It is easy to install with a simple push-fit connection. This grille is perfectly suited as an outlet for bathroom, toilet, or kitchen extractor fans, hydroponics in-line extract fans, or cooker hoods. As a genuine Kair product, it is compatible with Kair's extensive range of fittings and outlets for a complete ventilation solution. It can be used as part of a long ductwork run for various purposes including whole house ventilation, passive stack ventilation, positive input ventilation, air conditioning, HVAC, and Heat Recovery systems. This beige plastic ducting air inlet/outlet features gravity shutters and has external dimensions of 155mm x 155mm, with a 5 inch / 125mm round male rear spigot for indoor or outdoor use. The non-return shutter flaps automatically close when not in use, stopping odours, noises, or draughts. The gravity flap design eliminates the need for potentially breakable springs. Installation is straightforward with push-fit duct and fittings. It is suitable for bathrooms, kitchens, hydroponics, and in-line extract fans, and can be integrated into ductwork for whole house ventilation, passive ventilation, positive input, air conditioning, HVAC, and Heat Recovery Systems, complying with Part F Building Regulations. Airflow performance is independently tested.