Brown Louvre Extractor Air Vent & Back Draught Shutter 4 Inch
Brown Air Vent Ducting Grille & Back Draught Shutter
For 4 Inch (100mm) Extractor Fan Ducting
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.
ABS thermoplastic. Complies with Part F building regulations.
Suitable for commercial and domestic use.
100mm In-line Back Draught Shutter
In-line gravity operated back draught shutter.
Will stop backdraught and wind noise when a fan is switched off.
Made from tough, white GRP plastic.
Will fit standard size 100mm diameter ducting .
Should be mounted vertically as in picture.
See our eBay shop for many more ducting products.
(Please note that these shutters have 1 spring and not 2. This is correct as 2 springs would offer too much resistance)
External Diameter Approx 98mm
Helps prevents wind noise and backdrafts
ABS thermoplastic. Complies with Part F building regulations. Suitable for commercial and domestic use.