The Manrose 1162 Black is a crucial component for any ventilation system, specifically designed as a 100mm (4-inch) external gravity grille. It's used to provide an attractive and functional exterior termination for your extractor fan ducting, commonly found in bathrooms, kitchens, and utility rooms. This grille is highly useful as its integral gravity-operated flaps effectively prevent unwanted backdraughts, drafts, and even insects from entering your property when the fan is not in operation, while still allowing air to freely exit when the fan is running. Crafted from durable, black high-impact polystyrene (HIPS), it's built to withstand outdoor elements and seamlessly integrate with darker brickwork or exterior finishes. Installation is straightforward: simply connect the 100mm round spigot to your ducting and securely mount the square grille to your external wall, ensuring the flaps hang freely to operate correctly. Suitable for 4 inch ducting, it features 3 gravity flaps and a 4" diameter spigot at the rear. The grille measures approximately 5" square inside the frame and approximately 5.5" square including the frame.