Rytons Background Ventilation Calculator

Background ventilation calculator for habitable rooms

This 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.

Please note:

  • 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.
  • We have a comprehensive range of acoustic ventilators available for sites and properties with noise problems.

Make a calculation:

Sorry, we are currently experiencing technical difficulties with our online calculators.  Whilst we work hard to try and resolve this issue please contact our technical sales office on 01536 511874, or email your details to admin@rytons.com, where we will be happy to make the calculation for you.  Our apologies for the inconvenience.

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)