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

Brand	Knightsbridge