Rytons Background Ventilation Calculator

Background Ventilation : Good to Know
  • Our handy ventilation calculator will provide you with a total equivalent area requirement for any property using System 1 of the Building Regulations, Part F.  The calculation should then be used in conjunction with the finer details contained within Part F.
  • Background ventilators should be located in all rooms with external walls.  Once the total requirement has been calculated, at least 5000mm² equivalent area is required in each habitable room and 2500mm² equivalent area is required in each wet room.
  • Background ventilators should be sited to avoid draughts.  This can typically be achieved at a position of 1.7m above floor level.
  • We are always happy to assist you with product selections, call our technical team on 01536 511874 for advice.
  • Do you have acoustic issues?  We have a comprehensive range of acoustic ventilators available for sites and properties with noise problems.
Make a Calculation:
Total Floor Area (m2):   
Dwelling Type:    Single-storey located up to and including the fourth storey above ground level
Multi-storey, and single-storey located more than four storeys above ground level
No. of Bedrooms:   
Design Air Permeability:    Type A: Any design air permeability
Type B: Design air permeability leakier than 5m3/h.m2 at 50 Pa
Facades:    Single facade (one exposed facade only)
Multiple facades (two or more exposed facades)

  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.

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