I've never heard of anyone managing data center air speed -- but that doesn't mean nobody does it!
In my experience, the key factors are static pressure and cfm. Depending on who you talk to, you'll need 120-150 cfm per kW of rack load. If you're not supplying that through the subfloor, you'll have hot air recirculating around or over your racks -- a process I call "rebreathing" -- probably to the intakes of systems mounted higher in the rack. Another ineteresting problem is that racks near the air handlers get less air, due to the Bernoulli effect.
You can hire someone to survey your data center and make recommendations about how to cool hot spots and improve airflow to your servers. If you can't find anyone in the Advertising section, let me know and I can recommend a few.
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