External Air Valves

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External Air Valves

Browse our range of external air valves, wall grilles, cowls, roof vents and external terminals for domestic ventilation systems. External air valves are used as the outside termination point for ventilation ductwork, helping air enter or leave the property safely and effectively.

At BPC Ventilation, we supply external grilles, cowls, slate vents, tile vents, airbrick adaptors and wall hoods in a range of round and rectangular sizes. Our team can provide technical advice to help you choose suitable external ventilation terminals for your ductwork, MVHR, MEV or extractor fan installation.

Frequently Asked Questions

  • What are external air valves used for?

    External air valves, grilles and terminals are used as the outside connection point for ventilation ductwork, they allow air to enter or leave the property while helping protect the duct opening.

  • What is the difference between an internal and external air valve?

    Internal air valves are fitted inside the property, usually on ceilings or walls. External air valves or terminals are fitted outside the property, such as on an external wall, roof or soffit.

  • Do external air valves need insect mesh?

    Some external grilles and cowls include insect mesh to help reduce the risk of insects entering the duct.