Aperture Height: 300 mm Aperture Width: 300 mm Overall Size: 341 x 341 mm features: Single deflection grille Sizes are to suit hole aperture Single deflection supply grilles are suitable for duct, sidewall or ceiling applications Grille vanes are individually adjustable allowing air deflection to be set on site Frames and vanes are manufactured from HE9TF extruded aluminium with natural anodised satin powder coated finish as standard The frame is 12 mm thick with mitred mechanically jointed corners and the - Tadpole - blades are assembled as a core at 20 mm centres The bladee shown are mounted horizontally and are also available mouted vertically Frames can be supplied with pre-punched fixing as requested Standard sizes are 100 x 100 mm to 1000 x 1000 mm in 50 mm increments Can be ordered with removable core Other sizes available on request All grilles take 10-14 days to manufacture