Rytons Underfloor Ventilation Calculator

Underfloor Ventilation : Our Top Tips
  • Save time by using this handy calculator to work out how many Rytons Periscope Vents with Rytons Multifix Air Bricks are required for suspended timber or block & beam floors.
  • Ventilate the underfloor space by providing ventilation in two opposing external walls.  Ensure ventilation has a free and unobstructed path to all areas by making provision for ventilation air to pass through sleeper walls and other sub-floor obstructions.
  • Position ventilation clear of where hard landscaping and vegetation is likely to finish.
  • If flooding is a risk consider using Rytons Vertical Extension to raise the height of the Periscope by up to 1m above ground level.  This may prevent low level flooding and give the property a little more time against higher flood water.  Note: Flood water deeper than 1m should be allowed into the property to relieve pressure on the walls.
  • Buy or specify Rytons by name, as you may find alternative products have lower rates of ventilation which could leave the sub-floor under ventilated.  Find NBS Plus specifications for Rytons Periscope Underfloor Ventilator here, Rytons Multifix Air Brick here and Rytons Periscope Vertical Extension here.
Make a Calculation:
Total Floor Area (m2):   
Run of Exterior Wall (m):   

  1. Notices
    • Rytons reserve the right to improve specifications from time to time without prior notice.
    • All information is given in good faith and to the best of our knowledge is true and accurate, however no guarantee regarding its accuracy is given, nor should Rytons representatives or agents imply any such guarantee.
    • Customers should satisfy themselves that the products are suitable for the intended purpose.
    • Since delivery dates, the use of products and management of the labour involved is outside our control, no warranty is given nor should any warranty be implied by Rytons representatives or agents.
    • Calls to and from Rytons are recorded and may be monitored to help us maintain and improve our service.
    • ® Registered Trademark of Rytons Building Products Ltd. © Copyright Rytons Building Products Ltd 2016.
    • Full Terms & Conditions of Sale available here.
    • Rytons Building Products Ltd Design House, Kettering Business Park, Kettering, Northamptonshire NN15 6NL.
    • Registered in England 1058924.
Got A Question? Call 01536 511874 or complete the form below.

Your Name (required)

Your Email (required)

Telephone Number (required - only used in case of query)


Your Message