Gravity Shutter, 100mm, Black

• For use with 4"/100mm fans
• Compatible with 4"/100mm round rigid or flexible ducting
• Prevents backdraught air and rain penetration
• Prevents objects of vermin entering when the ventilation is not in operation

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.