Equivalent Area (mm2) to Airflow (l/s) Conversion Calculator

Building Type Determines background ventilation EA requirements (Table 1.7).

Room Type Required extraction/supply rates vary by room.

Floor Area (m²) Minimum rate is 0.3 L/s per m² of internal floor area.

No. of Bedrooms Determines minimum Whole Dwelling Supply Rate (Table 1.3).

Background Ventilation Design Velocity (m/s)* Used for EA conversion only. Default is 1.0 m/s.

Compliance Targets

Required Flow Rate: - L/s

Min. Background Vent Area (EA): - mm²

Recommended Products

Model	Nominal Flow (L/s)	Equiv. Area (mm²)	Compliance Status	Qty	Action

* Design velocity is defaulted to 1 m/s.

** This calculation is as per the requirements of Approved Document F Volume 1 2021.