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700 fpm for residintial
1000 fpm for the public
1400 fpm for industrial
Above velocities are I think at the main duct. At the supply diffuser, the velocity should be400 -500 FPM for low velocity Air Conditioning Applications.
I agreed mr.riaz with 400-500 fpm (2.0-2.5)m/s , It was called terminal velocity. In selection of diffusers plz check the NC level , the lower NC more better (30NC) .
neck size:
1. 150mm X 150mm - 50lps (105cfm) --- 6"X 6"
2. 225mm X 225mm- 100 lps( 211 cfm)--9" X 9"
3. 300 mm X 300mm -381 lps(381 cfm)--12"X12" ----maintain up to this diffusers , 300 cfm above can create noise above 30NC.
Thanks
It depends on noise and throw but normally it is 2.5 - 3.5 m/s
the speed is to FPM to insure a quiet sound level
the maximum flow rate and velocity depends in the type of usage generally it ranges from 2.4 mtr/sec to 3.4 mtr /sec in ideal condition in case of special industrial application refer to ashrae standard and DW 144/143 and SMACNA standards
