Internal Grilles and Airbrick Cowls
Installation Advice
- Internal grilles should be positioned over the internal opening of the cavity sleeve and fixed to the wall using screws and wall plugs
- External cowls are positioned over the face of the airbrick and fixed to the wall using screws and wall plugs, the opening of the cowl should face towards the ground
- Never block or restrict the flow of air through these ventilators. The louvre grilles have no insect screen fitted, this is in order to comply with British Gas requirements
- Use open louvre grills when ventilating a gas or heat producing appliance, never use hit & miss grilles in such situations