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  1. #1

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    Default Fans Fans Fans Fans

    yo.. i started my 80x80x160 grow tent with a blue cfl.. and a 5" OUT and 4" IN was sufficient
    now ive upgraded to 400w hps ive had to use a 5" and 4" extractions with carbon filters
    ive got a 6" oscilating fan in there aswell for circleation.. wud you recommend and intake alongside these 3 fans.?

  2. #2

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    wha? lol

    you have a 400w hps now and a 5" extraction with a 4" intake and you wanna know if you need intake?

    huh?

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    no i had heat issues with my hps in small tent.. so had to get 2 extractions! to get the extra heat out
    and i have a oscilating fan! just wondering if ill need an intake now or with such a negative pressure from
    2 ext can i just open the flaps on tent a jarr.?

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    well yeah there will be the negative pressure alright lol - might suck the plants through the filter lol - btw 1 cf or 2?

    do some temp tests and find out innit lol

    simples

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  6. #5

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    i have 2 cfs on the 2 extractions

  7. #6

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    a 5" extraction and a 4" outtake should be sufficient. what are the temps of the room that the tent is in? is there a window open in the same room? having a fan blowing just above the top of the plants will help too.

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    window is open in the room.. room temps are around 23c! inside tent around 29-30c
    have 2 extractions! and oscilating fan inside tent

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    ok so these two extraction fans are they both sucking air from the top of the tent and the intake blowing air into the tent from the bottom? or are you using an extraction fan at the top of the tent and an extraction at the bottom of the tent?

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    i have both my extraction fans fitted with cfs at the top of the tent.. 1 by door and 1 at back!
    im not using a intake fan at the moment.. i have the tent flaps open all round

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    passive intake sucks mate, you would be best off using an intake that blows air into the tent rather than trying to suck air in through the passive intake flaps

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  13. #11

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    passive intake sucks mate
    okay bro.. ill buy myself a 4" intake.. i can only suck air in from the room
    i cant put ductin from the window for stealth reasons.. what do you think.?

  14. #12

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    you really dont need 2 extraction fans fella. use the 5" as extraction and the 4" as intake. try and blow as much air into the tent as you can but keep the pressure negative. try and place the intake ducting just below or behind your osculating fan so it can then blow the intake air around the tent and see if that helps.
    Last edited by DON Greens; 03-09-10 at 07:43 PM.

  15. #13

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    when i just use 1 extraction my temps raise to around 34c! when i added the 2nd extraction i dropped it to 30c

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    do you use a fan controller? in all honesty though 29c - 30c isnt a major problem. i can understand why you swapped to two extractions if your temps were 34c. my mate has the exact same set up as you. 80x80x160 400w in a room with the window open and his temps are between 26c - 29c but he is using a fan controller.

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    does he use 1 IN and 1 OUT or does he need to exausts like mine.?
    i have the tt inline extractions! not the rvk top range ones
    ive seen them fan controllers but didnt really think they were worth it as mine are on 24/7 on full

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