MFAB – Rytons Multifix® Air Brick

General Details

MFAB – Rytons Multifix Air Brick

  • Robust interlocking air brick.
  • Grille design allows a high air flow with low pressure drop performance.
  • One size can form a unit 9×6, 9×9 etc.
  • Textured finish maintains aesthetic appearance.
  • Use with Rytons Periscope® Underfloor Ventilator PUFV and AirLiner® cavity liners 9×3, 9×6 and 9×9.
  • U.V. stabilised to slow down the effects of sunlight.
  • PLEASE NOTE: This item is a plastic component and therefore not suitable for use within the external walls of high-rise buildings requiring non-combustible materials, i.e. those 18m high or more complying to Regulation 7(2) and Approved Document B, and those 11m high or more complying to 2.7 of Building (Scotland) technical handbook 2019.  For compliant alternatives, which includes our tailor-made design service, see Rytons A1 Fire-rated Ventilation Range.


  • 215mm L x 66mm H x 58mm D (see image gallery above).
  • CAD drawing available by email.

Free Area:

  • 7,750mm² (77.5cm²) per unit.


  • Terracotta: MFABTC.
  • Buff/Sand: MFABBS.
  • Blue/Black: MFABBB.
  • Grey: MFABGR.
  • White: MFABWH.
  • Brown: MFABDB.
  • Black: MFABBL.


  • U.V. stabilised polypropylene.


  • No special fixing required.  Installation is fast and easy with Rytons Multifix Air Brick replacing a standard brick.  Place at high and low levels.  Vertically stagger above and below horizontal fire stops.

Handling Information:

  • Box quantity: 20 number.
  • Box size: 35cm W x 26cm H x 23cm D.
  • Box weight: 2kg.

Reference Material:

  • British Standard BS 493 recommends that for a louvre design air brick the size and shape of the apertures shall be such that a steel ball of 9.5mm nominal diameter shall not pass through.

NBS Plus Specification:

Pressure Loss Data