7/18/2019 Recommended Air Velocities

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Air Velocities in Ducts 

Recommended maximum air velocities in ventilation ducts

 Air velocities in ducts should not exceed certain limits to avoid high pressure losses andunacceptable noise generation. The values below are common guidelines for some typicalapplications.

 Air Ducts

 Air Velocity

(m/s) (ft/s)

Combustion air ducts 12 2! "! ##

 Air inlet to boiler room 1 $ $.$ %.&

'arm air for house heating !.& 1.! 2.# $.$

Vacuum cleaning pipe & 1( 2# "%

Compressed air pipe 2! $! ## %&

Ventilation ducts )hospitals* 1.& " (.% 1$

Ventilation ducts )office buildings* 2.! ".( #.( 1(