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Soffit Vent Type C -1137 and 1138

Efficient strip type eaves ventilators (primary vent) for use on roofs where the eaves incorporate a soffit board of between 6 and 9mm in thickness:

  • 1137 provides ventilation equivalent to a continuous 10mm opening (10,000mm² per metre run)
  • 1138 provides ventilation equivalent to a continuous 25mm opening (25,000mm² per metre run).

Supplied in lengths of 2.4m and available in a variety of colours.

View product range & add to quote

Features & Benefits

  •     Efficient, unobtrusive and easy to fit
  •     4mm wide slots comply with BS 5250:2011
  •     Durable and totally resistant to decay
  •     UV stabilised and colourfast

Applications

  • For roof eaves ventilation – soffit application
  • On roofs where the eaves incorporate a soffit board
  • With soffit boards of between 6mm and 9mm in thickness

Technical Information

Primary roof ventilators:

  • 1137 provides ventilation equivalent to a continuous 10mm opening (10,000mm² per metre run) to ventilate pitched roofs of 15° or more and when the roof void is uninhabited attic or loft space.
  • 1138 provides ventilation equivalent to a continuous 25mm opening (25,000mm² per metre run) to ventilate pitched roofs of less than 15°, flat roofs or any roof space where living accommodation is contained within the roof space.

Ventilation must be provided for the full length of the eaves and along both sides of the building to create cross flow ventilation action.

How to Order

  • Determine whether the roof design requires ventilation equivalent to a continuous 10mm opening (product 1137) or 25mm opening (product 1138)
  • Specify which colour is required
  • Measure the overall length of the eaves to be ventilated and divide by 2.4m (product length) to determine the number of lengths required

Installation Advice

The mouth along the edge of the soffit ventilator is ideally suited to accommodate a 6mm thick soffit board.

Soffit boards of up to 9mm thick can be accommodated with care, but it may sometimes be necessary to chamfer the edge of the board slightly to make insertion easier.

Soffit boards over 9mm in thickness cannot be accommodated unless the edge of the board is rebated down to a thickness of 6-9mm.

Ensure that the ventilator is fixed securely to the back of the fascia board using all of the fixing holes provided.

Screws are preferable but nails may be used with care.

Quality, Regulations and Standards

  • 4mm wide slots comply with BS 5250:2011
  • Satisfies all NHBC requirements
  • Manufactured to BS EN ISO 9001 Quality Management System
  • Manufactured to BS EN ISO 14001 Environmental Management System
  • Complies with all relevant Building Regulations
  • Meets all relevant British Standards

Material and Colour Choice

  • Manufactured by extrusion in UPVC
  • 1137 available in white, brown or black
  • 1138 available in white or brown
  • nbs plus
  • riba

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