Need Suggestions for Quiet In-line Fan

Discussion in 'First Time Marijuana Growers' started by case22, Mar 21, 2012.

  1. Hey everybody.

    So I just got a call from my parents asking if they could stay at my house for a day or two while they are passing through my town. I have discussed my use of marijuana as a sleep aid with them, but it would break my mother's heart if she found out I was growing. Thus, my problem arises.

    I'm currently using AC 120v 3.5" fans to vent, but that sounds like a small jet plane is trying to take off from within my closet; not very stealthy. I am looking at inline fans, but am worried they too will be a bit noisier than I would like.

    My closet is 31" x 44" x 96" = about 75ft^3. My light is 240w Blackstar LED. Would add some CFLs if I could keep temps down.

    I would like to stay sub $100 if I can, but If there is a noticeable jump in noise reduction / performance, I would spend a few extra dollars.

    My questions are:
    • Would a 6" fan connected to a speed controller be quieter than a 4"?
    • Does anyone have any opinions on the cheap (about $35 US) carbon scrubbers on amazon? I am currently running a DIY but I figure $35 is worth the peace of mind.
    • Can anyone give any input on the fans (or fans similar) listed below?
    • Do the significantly cheaper inline duct "booster fans" have enough static pressure to substitute a centrifugal type fan?
    What I'm looking at:

    I'm looking at fans on Amazon (I've got a $50 gift card just waiting to be spent) such as the ones below. I was trying to find a fan and carbon filter for sub $100 but I do not think that will happen.

    4" by Lighthouse Hydro - $95.99
    Amazon.com: 4" Inline Fan 190 CFM Hydroponics Inline Duct Fan Exhaust Blower Vent: Patio, Lawn & Garden

    4" by Earth Worth - $94.95
    Amazon.com: Earth Worth 4 Inch High Volume Fan for Grow Tents And Hydroponics 200 Cubic Feet Per Minute: Discount Tommy

    6" by ValuLine - $82.99
    Amazon.com: 6 Inch ValuLine Centrifugal Inline Fan: VM Innovations

    6" by Active Air - $95.99
    Amazon.com: Hydrofarm Active Air 6 inch In-Line Fan 400 CFM: Home & Kitchen

    I also saw some inline blower fans (I think they are for the engine room of a boat, though I am not sure) they are pretty cheap and claim to move some pretty substantial air such as this one here:

    4" by HRP Sports - $29.99 + $6.99 shipping
    Amazon.com: 4" Inline Blower - 235 CFM - 12 Volt - 1.3 lbs - 5 1/4" (h) x 4 3/16" (w) x 6" (l): Hoerr Racing Products
     
  2. dont get the off brand fans they are noisy as hell. I once had a 8'' "crystal king" centrifgugal fan i thought was a good deal for $120 a few years ago... well i would have spent the extra 40 if i had known it sounds like a phreaking airplane coming in for landing, I use a 6'' valuline it's very quiet but fir your space a 4'' valuline should cut it. Shouldn't cost more than $80 shipped.
     
  3. no on the duct booster, and IMO no on the off brand carbon scrubber... however NO also on small sized carbon scrubbers (any brand(
     
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