How many fans do I install in my box for a 150w hps

Discussion in 'Growing Marijuana Indoors' started by lifespassenger, Aug 31, 2009.

  1. #1 lifespassenger, Aug 31, 2009
    Hey everyone,
    I am building a grow box out of one of those storage cabinets I got from home depot. Im going to put a 150watt hps light in it. How many Fans should I install to keep it cool.


    Thanks for all your help
     
  2. #2 leafman, Aug 31, 2009
    all depends what size fan ,i have a grow tent i made myself and i have just got a 4in sq pc fan blwing in ,keeps the temp spot on and am use 600 w hps ....
     
  3. #3 Miclo20011, Aug 31, 2009
    ive got a 150 hps for my 4x2x2 growbox and i use only one 120mm(4inch) pc fan and a honeywell 8inch floorfan(to keep air circulating)..it works fine..heres a link to my setup
    http://forum.grasscity.com/blogs/miclo20011/2068-i-entered-my-plants-into-12-12.html
     
  4. #4 hawkman, Aug 31, 2009
    I have a similiar setup from Lowes. I have found that the doors need to be open to keep temps in the upper 70's. I have two 4 inch inline fans. One exhaust out the roof and intake in back. Had to get a cheap humidifier from Target to get into the 60's for humidity. Good luck. HPS lights get very hot but they are worth it.
     
  5. #5 Phoggy, Aug 31, 2009
    Wow you guys are lucky, maybe its my bulb, but my 400 watt hps will bake a entire 15x20 foot room plus the closet. I needed a rather large blower fan to get temps down to what I was looking for. Pc fans would be a joke in my case. I if I were to guess I would say more then 1 pc fan, I would do 2 minimum for outtake but thats just me.
     
  6. #6 greenthumb951, Aug 31, 2009
    i have the same problem... im runnin a 250w mh in a 2x3x5 room and with one intake and one exaust temps soar to the 90's..! i dont see how you guys keep temps down with out a ac??? are you guys pullin air form your light? i have a built in ballast on my 250.. so theres no exaust for the light but i was thinkin of drillin a hole in the hood to pul heat from the bulb... i just installed a portable ac in my small ass room so hopefully that helps... anyother ideas?
     
  7. #7 Phoggy, Aug 31, 2009
    Right now im streaming the blower out of the window with ducting tube. I have another fan in the window the ducting tube is fastened into to make it appear as just another window fan. Then I have another window I just leave open for a passive intake. I taped my vents and got my door as air tight as I could. For now this works but in the winter its going to look weird having a fan billowing heat out of the window. Im going to need a more legit rig soon.
     

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