ventilation calculator
Step 1
How many Bedrooms?
Total floor area
minimum rate I/S
Property requires I/S
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Background ventilation
Type of system being installed
Does the property have any solid fuel appliances (i.e. Fireplace, log burner etc) ?
Contact us for a bespoke solution on Ventilating Solid fuel fires.
Does the property have external windows in every habitable room ?
Contact us for a bespoke solution.
Number of habitable rooms (i.e Bedrooms, living room, dining room)
Total Equivalent Ventilator Area Required
Equivalent Ventilator Area Required Per Room
“Disclaimer: The ventilation calculator is intended for general informational purposes only, generating results based on user inputs, standard parameters, and assumptions. It is not a substitute for professional advice, engineering assessments, or site-specific considerations. For a more accurate ventilation assessment and proposal tailored to your property, we recommend using Retrofit Experts LTD's ventilation survey service. The creators of this calculator disclaim any liability for decisions or actions based on its output.”