Brown Louvre Extractor Air Vent & Back Draught Shutter 4 Inch Screws and Fixings When bent into an angle:

When bent into an angle: 35mm x 35mm

These popular birds come to the UK for three months during the summer to raise their young and can be seen on warm evenings giving spectacular displays

side lights and indicator lights

Designed to cover the opening of a 9" x 3" airbrick

however in individual cases additional hose may be necessary

Brown Louvre Extractor Air Vent & Back Draught Shutter 4 Inch Screws and Fixings When bent into an angle:Product Description Brown Air Vent & Back Draught Shutter For 4 Inch (100mm) Extractor Fan Ducting Louvre Vent Louvre wall vent with weather sill. Helps prevent backdrafts. Manufactured with UV stable materials to reduce colour fade. Dual fitting for round 100mm (4 Inch) ducting or square ducting. Overall size: 140mm x 140mm. British made. ABS thermoplastic. Complies with Part F building regulations. Suitable for commercial and domestic use. Other