Original message
| farmlivin
 |  "centrifical fans"
, posted Wed 11 Jan 12:49  
Can someone please tell me if I have a commercial centr.fan and the downstream chilled water coils are changed to a different fins per inch, thus creating a less restricted downstream air flow, would/could that create an extream increase/vacuum on the suction side of the fan. I understand if the downstream side is closed off a centrifial fan will just sit there churning away, creating heat but not moving any air, but what about no downstream restriction?
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Replies:
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| chiller guy
| "Re(1):centrifical fans" , posted Wed 11 Jan 16:04
Think of the fan as an "Air Pump". The fluid it pumps is air and acts like a water pump. If there are no, or little restrictions they both pump their hearts out (will overload). However; if you restrict the flow (valves, dampers,coils, filters, etc.)the flow drops off accordingly. Thus the need for air balance or water balance!
A more important question is how changing the fins per inch (why?) will affect the capacity of the coil?
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
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