PUFV – Rytons Periscope® Underfloor Ventilator

General Details

PUFV – Rytons Periscope Underfloor Ventilator

  • An underfloor ventilation system for block and beam and timber floors.
  • Expands up to 5 brick courses.
  • Prevents damage by condensation and the build-up of dangerous gases.
  • For use with Rytons Multifix® Air Brick MFAB.


  • 218mm W x 250mm D x 368mm H (fully extended and with Rytons Multifix Air Brick fitted) (see image gallery above).
  • CAD drawing available by email.

Free Area:

  • 7,750mm² per unit (with Rytons Multifix Air Brick fitted).


  • Black.


  • Polypropylene.


  • No special fixing required.  Installation is easily carried out as work proceeds.  Adjust the height of the Periscope to suit brick courses and height of floor (cutting if necessary).


  • To vertically extend more than 5 brick courses use Rytons Periscope Vertical Extension PUFVVEXT.
  • To connect soil pipe for extended ducting use Rytons Horizontal Adaptor HADAP100.
  • To horizontally extend through wide inner or outer leaves use Rytons 9×3 Non-Telescopic Cavity Liner TCL8LNR.

Handling Information:

  • Box quantity: 20 number.
  • Box size: 81cm W x 45cm H x 31cm D.
  • Box weight: 8.4kg.

Reference Material:

  • Suspended Timber and Suspended Concrete Floors: Ventilate the underfloor space by providing ventilation in two opposing external walls so that the ventilating air will have a free path between opposite sides and to all parts.  Ventilate voids by openings providing not less than 1500mm²/m run of external wall or 500mm²/m² of floor area, whichever gives the greater opening area.  Provide ventilation in internal sleeper walls or similar obstructions to maintain the path of air.
  • The NHBC recommends ventilators for suspended timber floors be spaced at not more than 2m centres and within 450mm of each end of any wall.
  • The Building Regulations state any pipes needed to carry ventilating air should have a diameter of at least 100mm.
  • Also refer to: The Building Regulations 2000, Approved Document C,
  • The Building (Scotland) Regulations, Mandatory Standard 3.4,
  • NHBC Standards,
  • British Standard BS 5250.

NBS Specification: