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Air Grille Selection
Calculates the pressure losses occurring in single- and double-deflection air grilles, with or without dampers, used in ventilation systems.
System Component
Single Deflection Grille
Double Deflection Grille
Damper Position
No Damper
Damper Fully Open
Damper 50% Open
Damper 25% Open
Airflow Rate
m³/h
L/s
Width / Height (W/H) (mm)
150
200
250
300
350
400
450
500
600
700
800
900
1000
100
150
200
250
300
350
400
450
500
550
600
Recommended Air Velocities
Comfort Applications
Industrial Applications
Supply Grille
1.5 – 3 m/s
3 – 4 m/s
Return / Exhaust Grille
2 – 3 m/s
4 – 8 m/s
Outdoor Air Louvers
3 – 4 m/s
4 – 6 m/s