Brand new double side ventilation door grille. 400x 200. Have 30 of these in stock. Non-vision door grilles are two piece grilles designed to be installed in doors or partitions. They allow free movement of air but allow no sight of one side from the other. They are supplied with an additional frame that gives a smart finished appearance on both sides. The telescopic frame suits doors or partitions from 25mm to 45mm wide Chevron type blades spaced at 20mm centres for maximum free area consistent with non-vision construction. Approximately 50% free area. Clips located on the inner frame snap fit the outer frame, eliminating the need for rivets or screws. Standard finish natural anodized.