Intake vent with light trap

Discussion in 'Indoor Growing' started by fdd2blk, May 11, 2008.

  1.  
    fdd2blk

    fdd2blk POW Staff Member

    anyone got any ideas for me? i need to put one in the lower left corner of this sheet rocked wall. it needs to go on the outside. IMG_6808.jpg IMG_6809.jpg
  2.  
    fdd2blk

    fdd2blk POW Staff Member

    i'll take it that's a NO?

    i'll figure something out.
  3.  
    fdd2blk

    fdd2blk POW Staff Member

    "I stumped the forum." :)
  4.  
    Red Eye Jim

    Red Eye Jim Active Member

    I was told that you can purchase a light filter from a darkroom photography supply store that lets air through but blocks light. Is this what you were looking for?
  5.  
    fdd2blk

    fdd2blk POW Staff Member

    yes, this is what i'm looking for. i'll google that. thank you. :mrgreen:
  6.  
    fdd2blk

    fdd2blk POW Staff Member

    this is interesting.........



    (this is for darkrooms but it's basically the same)

    Terry XXXXXXX , Sep 01, 2000; 08:20 a.m.
    The easy answer is to buy a darkroom fan and darkroom vents. These are manufactured devices that are light proof and have a fan or not.
    <p>
    I would be careful venting into a crawl space. I would run a duct from the exhaust to the outside.
    <p>
    For 880 cf, you want a fan of between 88 and 220 cfm. That will give you between 6 and 15 air changes per hour. Remember to take into account that ducting will reduce the air flow of the fan due to backpressure (technically static pressure losses).
    <p>
    The best setup for a darkroom is a combination of positive and negative pressure ventilation. You blow filtered air into the darkroom and you power exhaust air at the same time. You size the fans such that you blow in slightly more air than the draw out. This way any leaks leak air out of the darkroom, rather than in carrying dust.
    <p>
    THe best place to exhaust is over the sink. This way the chemical vapors and dusts are removed closest to the source. The absolute best way is via a slot hood. This is an opening about 1-2 inches high the width of the sink. This is the exhaust port. You then size the exhaust fan to suck about 200-400 cfm throught the slot. Antyhing from the sink rises slightly and then back and out the exhaust. I built this for my sink and it works great.
    <p>
    BTW my background includes industrial ventilation design for contaminant control. So I am giving you advice to make a GREAT setup. The other posts will work, maybe not as well, but they will work. The big thing is to exhaust near the source and get enough airflow.
  7.  
    fdd2blk

    fdd2blk POW Staff Member

    well i'm not the only one. i google "light proof vent" and i get 100 grow sites. everyone asking the same question i am. no positive answers. a bunch of Mc Gyver stuff but that's it.
  8.  
    shamegame

    shamegame Well-Known Member

    You can get baffles from some hydro shops that fit over the end of the exhaust and don't let much light in. Also people take black fabric or like panty hose and stretch it over the exhaust, sometimes do this reduntantly to make sure no light gets in.
  9.  
    fdd2blk

    fdd2blk POW Staff Member

    now that you mention it, i need to cover my exhaust as well. :mrgreen:
  10.  
    W33D

    W33D Well-Known Member

    Hook some black tubing up long enough so light doesn't show through. Have it sealed on the inside part of the intake vent, and run the tubing along the bottom of the room, giving it "corners" if necessary to block light and allowing fresh air underneath the canopy. This is one method that came up in a brainstorm. Another was making block sort of thing like steps inside so light doesnt bounce off the "/\/\/\" and get through the other side. Get it?
  11.  
    fdd2blk

    fdd2blk POW Staff Member

    doesn't anyone here vent their rooms????
  12.  
    CALIGROWN

    CALIGROWN **4*****:****2*******0***

    I would think you would want to insulate that as much as possible...easier to maintain a constant temp....
  13.  
    CALIGROWN

    CALIGROWN **4*****:****2*******0***

    and as far as a vent..a small sheet metal vent or a small blower fan to pull air out of a hole cut in the wall......like a dryer type vent maybe
  14.  
    fdd2blk

    fdd2blk POW Staff Member


    :confused::confused::-?:-? i've never had a problem. :blsmoke:
  15.  
    skunkdog

    skunkdog Well-Known Member

    ya could use pvc elbow's and make a s bend trap, abit like the plumbing under your sink?
    also paint them black on the inside.
  16.  
    fdd2blk

    fdd2blk POW Staff Member

    i think i may go with this. my buddy builds swimming pools and has a garage full of fittings and pipe. i could make it look like the stack on a semi. :mrgreen:
  17.  
    W33D

    W33D Well-Known Member

    ^^^BASTARD! That was my idea, steals credit!
  18.  
    Picasso345

    Picasso345 Well-Known Member

  19.  
    t0k3s

    t0k3s Well-Known Member

  20.  
    fdd2blk

    fdd2blk POW Staff Member

    got it. thank you everyone for all the ideas. i put them all together. :blsmoke:




    i went with black PVC 4". i used a couple elbows to diminish light. i then stretched black pantyhose over the end and capped it with a cute little cap..........

    IMG_6865.jpg IMG_6866.jpg IMG_6862.jpg IMG_6863.jpg



    for the exhaust i used the box my new fan came in. i flipped it over the top of the hole and secured and sealed it with tape and staples. then i cut a door in the side. i covered that with pantyhose and made the door adjustable........

    IMG_6861.jpg


    it all works great. :blsmoke::peace:

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