190 mm x 190 mm Plastic ducting air inlet / air outlet with gravity shutters. Features a 5 inches / 125 mm round male spigot for easy connection. Suitable for indoor or outdoor use, 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 mean no reliance on breakable springs. Easy to install with a simple push-fit connection for ducts and fittings. Ideal for bathroom or kitchen extractor fans, hydroponics fans, or in-line extract fans. This grille can be integrated into ductwork for various applications such as whole-house ventilation, passive ventilation, positive input, air conditioning, HVAC, and heat recovery systems.