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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

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