FR250BR – Rytons Flat Roof/Abutment Ventilator (897mm L)

General Details

FR250BR – Rytons Flat Roof/Abutment Ventilator (897mm L)

  • Flat roof and abutment ventilator.
  • Fixed to the top of the facia board or timber upstand at the abutment, to introduce air into the roof void.
  • For roof pitches less than 15°.
  • Large fixing holes aid easy and accurate positioning on top of facia boards and upstands.
  • 4mm ventilation slots promote unrestricted air flow and prevent the entry of birds and large insects.


  • 897mm L x 68mm W x 27mm H (see image gallery above).
  • CAD drawing available by email.

Free Area:

  • 22,425mm² per length (25,000mm² per metre).
  • Equivalent to a continuous 25mm venting gap.


  • Brown.


  • High impact polystyrene.


  • Fix to the top of the facia board and overlay with plywood and felt. For an abutment installation first create a void by securing a softwood timber upstand to the roof timbers at the abutment (maintaining a gap of at least 25mm with the wall). Fix to the top of the upstand through the pre-formed slots across the top of the ventilator. A timber fillet should be placed on top of the ventilator before being dressed with lead.

Handling Information:

  • Box quantity: 20 lengths.
  • Box size: 102cm W x 12cm H x 35cm D.
  • Box weight: 3kg.

Reference Material:

  • British Standard BS 5250.
  • The Building Regulations, Approved Document C.
  • The Building (Scotland) Regulations, Mandatory Standard 3.15.
  • The Building Regulations (Northern Ireland), Technical Booklet C.
  • NHBC Standards, 7.1 Flat Roofs.