This 190 mm x 190 mm plastic ducting air inlet/outlet features gravity shutters and a 6 inches / 150 mm round male spigot for indoor or outdoor use. It is designed to terminate your extract duct to an external wall. The non-return shutter flaps close automatically when not in use, preventing unpleasant odours, noises, or draughts from flowing back through your duct. Its gravity-operated flaps do not require springs that could break, ensuring durability. Installation is simple with a push-fit design for the duct and fittings. This grille is perfectly suited for bathroom or kitchen extractor fans, hydroponics fans, or in-line extract fans. It can be integrated into longer ductwork runs for various applications including whole-house ventilation, passive ventilation, positive input, air conditioning, HVAC, and heat recovery systems. Manufacturer: SolaDirect.