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I don't think you are understanding my posts, I'll try to clarify. That server in the photo is not the server I am measuring off - it is a generic image from Google. Yes those fans are small, I don't see why that is relevant though. There are many more fans in the system. The servers we have...

Those two fans on the server in the picture are just for the power supplies. There are more inlet fans in the front. I need to measure the airflow going in each server and coming out of each server vent, along with the temperature at each in order to calculate the heat produced by each card...

This is for a server rack in defence, so unfortunately I can't post any photos and we can't hire subcontractors in to do the work. My job is to measure the airflow coming in to the server rack and each individual server, then to measure how much air is coming out of each of the server outlets...

See my issue seems to be that we are trying to measure the flow coming out of a grid shaped vent, and not a duct. If it was a duct I could work out (similar to the procedure in the above PDF) the velocity profile and hence average velocity. But being a vent on a much larger square box, a fully...

I have to work out the air mass flow coming out each vent on a server and have proposed to use a hot wire anemometer to measure the air velocity at each vent by placing it slightly inside one outlets of the vent (it is a grid pattern), then multiply that by the vented area and air density to...