How to use the required ventilation flow calculator
Find the fresh air supply needed for a number of occupants at a set rate per person. Enter number of occupants, fresh air per person in the fields above; the required fresh air are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “fresh air rate”, “ventilation for classroom”, “occupant fresh air”, “calculate required ventilation flow”, “find required fresh air”.
Formula
Variables
- n — Number of occupants
- rate — Fresh air per person (L/s)
Worked example
With number of occupants = 10, fresh air per person = 8 L/s, the calculator gives required fresh air ≈ 80 L/s; required fresh air ≈ 288 m³/h.
Frequently asked questions
What is the required ventilation flow calculator used for?
Find the fresh air supply needed for a number of occupants at a set rate per person. It helps with questions such as “fresh air rate”, “ventilation for classroom”, “occupant fresh air”.
What is the formula for the required ventilation flow calculation?
Required fresh air (L/s) = n × rate. Required fresh air (m³/h) = [Required fresh air] × 3.6. Here n is number of occupants, rate is fresh air per person (L/s).
What inputs do I need for the required ventilation flow calculator?
You need number of occupants, fresh air per person in L/s. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the required ventilation flow calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the required ventilation flow result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.