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3 -4 FPS velocity is standard practise
according to AWWA C61 it is2.5 to3.5 fps
according to NFPA24 it is not less than10 fps
rule of sumb it is3 fps
if anyone find a specs related to HVAC please give a comment, thanks
2.5 to3.5 as far as my experience goes
from my experience it is preferable to be between5 to8 m/s
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