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I am trying to set up an axial fan

I am trying to set up an axial fan

I am trying to set up an axial fan

(OP)
I am trying to set up an axial fan rig.  I have calculated the max. mass flow through it, and now need to find out what size ORIFICE PLATE should be used.  I have a copy of BS 1042, but this is since 1943, far too old with imperial units not metric.  This has examples of how to calculate the orifice plate size but isnt too helpful for this day and age. I have looked at the new updated British Standard on-line but it is only in parts and still doesn't give sufficient detail.

I have basically got a just a fan, and am trying to incorporate it into a rig. I need to calibrate it first and work out what size orifice I should use.It is run at a 1500rpm and is 240mm in Diameter.

I need an equation that is used to find this out.  How can I find this out? which British Standard covers this flow measurement?

Any suggestions would be most appreciated! (This is the 1st time I have used this)
 

RE: I am trying to set up an axial fan

I can only suggest you do the metric conversions. Air flow today is the same as it was back in '43.

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