For 4 Inch  (100mm) Extractor Fan Ducting

In-line spring operated back draught shutter.

Stops back draught and wind noise when a fan is switched off.

Made from tough, white GRP plastic.

Fits Inside standard size 100mm diameter ducting.

Fit the shutter with the centre spindle of the flaps in a vertical position and make sure ducting is level.

Other ducting products availabe in our shop.

Please note that these shutters have 1 spring and not 2.

This is correct as 2 springs would offer too much resistance.

ABS thermoplastic.

Complies with Part F building regulations.

Suitable for commercial and domestic use.