Knightsbridge 100mm/4" Gravity Shutter Black

Ideal fuss free solution when you need to install a hole in an external or internal wall. Suitable for use with 4 inch/100mm fan via round ducting.

·           For use with 4 inch/100mm fans

·           Compatible with 4 inch/100mm round rigid or flexible ducting

·           Prevents backdraught air and rain penetration

·           Prevents objects of vermin entering when the ventilation is not in operation