Buff Hooded Cowl Vent Cover For air bricks, vents and grilles 9 x 9 Inch ( 228mm x 228mm ) Weather protection cowl. Other cowl sizes and colours available in our shop. Wall vent cowl cover for air bricks vents and grilles. Surface mounted. Protects against excessive weather conditions. Helps prevent wind noise draughts and air Blast through air bricks etc. Manufactured with UV stable materials to reduce colour fade. Overall size 10¾" x 9¼" (275mm x 235mm ) Bottom edge protrudes 4" ( 100mm ) British made. Suitable for commercial and domestic use.