to much negative pressure

Discussion in 'Grow Room Design/Setup' started by gumba88, Oct 15, 2012.

  1. I have a 8in inline fan hooked to my lights inside the tent blowing air out of the tent. The fan only runs 471 cfm. I also have two 8 in ducts coming in from my HEPA filter from outside. The filter is rated for 1300 cfm and is 6in. I have so much negative pressure the tent is getting sucked in about 3-4 in per side. If I open 1 half moon window on the bottom I have no problem with the pressure. Please help I need the space in the tent I'm losing. What am I doing wrong?
     

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  2. You can do 2 things.. first one is to lower the fan speed with a fan speed controller until pressure is normal. Second one is make your intake bigger that is why when you open the tent up a bit everything is ok
     
  3. Nice set up, another option is adding an intake fan of some sort, no higher than third the power of your extractor ;)
     
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