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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
  • nbs plus
  • riba

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