those cheap inline duct fans...

Discussion in 'Grow Room Design/Setup' started by tidehigh, Jan 20, 2010.

  1. #1 tidehigh, Jan 20, 2010
    http://www.lowes.com/pd_185009-1061-DB206_0_?productId=3089845&Ntt=inline%20fan&Ntk=i_products&pl=1&currentURL=/pl__0__s?newSearch=true$Ntt=inline%20fan$y=0$x=0&spellCorrectedTerm=

    i read that a single 90 degree turn in ducting can bog these things down. what is your experience with them? where should it be mounted in the ducting?

    i'm coming out of the top of my box turning directly down (90deg) and connecting to the floor (4ft down from turn). should the fan be mounted at the floor, at the box, or in between? will this be sufficient enough to turn over the air in a 24 sq foot box with a 250w hps inside? intake temps will be about 70deg
     
  2. #2 tidehigh, Jan 20, 2010
    will a 8"x4" rectangular vent be enough intake for this fan?
     
  3. #3 tidehigh, Jan 20, 2010
    keep reading mixed reviews. can i assume there are just some bad apples? i don't need a major fan (small box), it needs to be cheap, but i don't want it going out on me, or doing nothing at all
     
  4. #4 tidehigh, Jan 20, 2010
    one more simple question. where does the wire run otu of this thing? do you have to run the plug out the duct?
     
  5. #5 tidehigh, Jan 20, 2010
  6. #6 paint_u_dgt, Jan 20, 2010
    What kind of box dimensions are we talking?

    Those inline booster fans are OK as supplemental fans to boost the airflow in an inline venting scenario.

    They dont work to well on their own for venting heat. For one think the rating is a boosted CFM rating on actual airflow. They also have plastic blades which can melt from the high temps and cause seizure and fire.

    Better off with something like this:

    High Tech Garden Supply

    It is always better to have more airflow than not enough.
     
  7. #7 tidehigh, Jan 21, 2010
    It's a small box. 3 ft high. Lil less than 3 wide and 20 " deep
     
  8. #8 paint_u_dgt, Jan 21, 2010
    Thats not very much space for an HPS as the light will need to be at least 10" from the plant farther if you dont have a strong fan. leaves you 26" of vertical growth. Your gonna be doing LST I'm assuming.

    Just remember that your plant will likely double in size when you switch to flower.
     
  9. #9 tidehigh, Jan 21, 2010
    yeah its gonna be tight for now but this is temporary. after the last frost ill be moving to my outside shed and will have a much bigger area to flower. that's part of the reason i'm skimping now. this duct fan can be go on the light i get for out there i'm thinking.
     
  10. #10 paint_u_dgt, Jan 21, 2010
    I'm sorry was that another question?
     
  11. #11 tidehigh, Jan 21, 2010
    haha nope. just an explanation of why i'm doing what i'm doing now. preciate the thoughts
     
  12. #12 MMJ mang, Jan 26, 2010
    I know a 6" duct booster from home depot will keep it 5 degrees F above ambient. I know of someone who has one at the end of a 3 foot run with a 90 degree bend comming out the top of the box. The box is 18"X15"X36" tall with a 4"X12" intake with filters to block light. Ohh, the box has 220 watts of PL-L lights

    With these inline duct boosters, they will move air, but will not pull air through filters or similar blockages very well
     

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