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1m Over Fascia Vent

Installation Advice

  • Use product OF/1 to ventilate pitched roofs, where the pitch of the roof is 15° or more, and the roof void is an attic or loft space
  • Use product OF/2 to ventilate pitched roofs, where the pitch of the roof is less than 15°, where there is a flat roof, or any roof where living accomodation is contained within the roof space
  • Make sure each ventilator is fixed securely into the top of the fascia board by putting screws or nails through each fixing hole provided
  • On pitched roofs it is advisable to provide a felt support above the fascia ventilator, this will prevent the felt from sagging behind the fascia board whilst maintaining a clear air path at the front
  • When ventilating flat roof abutments with product OF/2 some extra joinery work is essential
  • Ventilation must be provided for the full length of the eaves and along both sides of the building to create a cross flow ventilation action
  • nbs plus
  • riba

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