Understanding of Pressure

Discussion in 'Grow Room Design/Setup' started by nja_0001, Sep 13, 2007.

  1. Ok im in the market for exhaust fan and intake for the flowering cab. My understanding of pressure is as velocity(CFM) increases, Pressure Decreases.(Blow between 2 sheets of paper they attract one another). If using a filter you want to keep the pressure high to push through the filter. So i guess the only solution to this would be to run a larger fan/blower/cage, not a full speed? I dont really know how to go about this. My flowering Cab has 13.77Cubic feet. So if my math is correct 1 40CFM should be place the air every 2.9 mins in a 13.7cuft cab. What is the recommended time to replace the air in a cab. Also how accurate are the CFM ratings on blowers and fans?
     

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