Louvre Sizing Calculator

Input design airflow and louvre dimensions to analyze face and free area velocities.

Design Airflow (l/s)

Louvre Width (mm)

Louvre Height (mm)

Calculated Face Velocity

Actual Free Area (%)

Actual Free Area Velocity

Louvre Free Area @ 2.5 m/s

Louvre Free Area @ 3.5 m/s

*Blades drawn at 150mm conceptual spacing.

Note: Aim for 2.5 m/s to 3.5 m/s of air velocity through the louvre free area to mitigate water carry-over and excessive pressure drop.