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How do I fix a too-strong fan?

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    HELP! How do I fix a too-strong fan?

    I have a 171 CFM Hurricane but even with my speed controller on low it sucks my 2'x4'x80" tent inwards- I've been having to leave the zipper cracked at the top to stop the tent from (I assume) eventually tearing. How do I fix this?
    Attached Files

    #2
    The tent should suck in some, yours seem to be a bit extreme. If you're growing autos just leave it open enough to reduce suction like you have been doing. Hopefully someone will have a better way.
    Born August 1956.


    Coco-Coir/Perlite Mix
    Mega Crop Nutrients, Bud Explosion.
    36"x36"x73" Grow Tent
    4 bulb T5's for Veg.
    2 VipraSpectra 450 LED for flowering
    IPower 4" Exhaust and Scrubber
    3 Gallon fabric pots.

    Comment


    • Asha
      Asha commented
      Editing a comment
      Oh good, I was really worried about having the tent open but they are autos. Thank you!

    • uncledoug
      uncledoug commented
      Editing a comment
      You're welcome, happy I could help.

    #3
    What kind of speed controller? Variable?
    ​​​​​​3 X 3 gorilla. Promix soil . Green Planet Nutes
    Mars Hydro
    Vortex in-line 6" fan

    Comment


      #4
      Welcome to GWE Asha your at the right place ! Do you have any ventilation (air) coming into the tent. It appears you have a vent in the back bottom of your tent that can be used to adjust the neg pressure from the fan by opening it as needed (least light intrusion) but still maintain a neg pressure system without worrying about a collapse. Just a thought . Good Growing !!

      Comment


        #5
        I use a intake fan it also winds my plants

        Comment


          #6
          Open the passive air ports located on the bottom of the tent. That will allow more passive air to enter the tent and will lessen the negative pressure inside the tent.
          The first picture, it appears that the passive air port is closed on yours.
          4x4 600w HID empty for summer
          3x3 400w HID with Bruce Banner and Skywalker Kush
          2x2 65w Quantum Board LED with 4 mother strains
          running all simultaneously for a perpetual harvests.
          https://forum.growweedeasy.com/forum...hash-adventure

          Comment


          • Asha
            Asha commented
            Editing a comment
            Is there a way to do that without letting in light or is it just a trade-off?

          • Toker1
            Toker1 commented
            Editing a comment
            Minimal outside light gets in. Unless you are shining a light directly in. No more light than a full moon night imo.

          #7
          Hey Asha, how did you make out with your ventilation system? Were you able to adjust the air intake/vents to relieve the vacuum ? Hope things worked out ! Good Growing !!

          Comment


          • Asha
            Asha commented
            Editing a comment
            So far leaving the zipper open a bit at the top has been adequate but still messing around with things to figure out a better solution!

          #8
          I have the exact same hurricane fan in a 3x3 tent and mine also did the same. As a poster above said, let more air in by opening up some ports on the bottom and your problem will go away.

          Comment


            #9
            Asha, perhaps try a less efficient route of the ducting. Create a few S bends, like a snake. That may hinder the flow.
            If the duct is 6” maybe a 4” adapter could worsen the fans effectiveness.
            Im just a shy guy with a big dick.

            Comment


              #10
              You could try buying a vent pipe with a damper and attach it to the end of your exit duct and use the damper to reduce the air flow even more. On mine I put a T inside with 2 dampers to regulate how much recirculates and how much exits the tent area.

              Comment


                #11
                Hello Asha, if you are still having problems, attached photo is of your tent and the vents we explained that you can open at the bottom part of the rollup flap and revelcro the sides so the bottom stays open allowing fresh air to come in and light out. Your zipper would allow more light in than the vents. Hope it helps. If you solved the problem than thats a good thing! Good Growing !!

                Comment


                • Asha
                  Asha commented
                  Editing a comment
                  Thank you so much for taking the time to do this! I opened up the vents and my tent is now fully zipped up with no issues!

                • Colombo
                  Colombo commented
                  Editing a comment
                  Glad you were able to solve your issue and get to growing without the added stress ! Good Growing !!

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