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12 x 9mm ( 3/8 inch )12 x 13mm ( 1/2 inch )12 x 19mm ( 3/4 inch )12 x 25mm ( 1 inch )Measurement is the tool hole size
Louvred 4mm flyscreen grill prevents entry of birds and large insects
Unobtrusive method of ventilation
Louvre wall vent and weather sill
Brown Louvre Extractor Air Vent & Back Draught Shutter 4 Inch Ironmongery 12 x 9mm ( 3/8Product 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