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Window Vent designs on a budget

Discussion in 'Grow Room Design & Setup' started by Mass Medicinals, Sep 7, 2017.

    Mass Medicinals

    Mass Medicinals Well-Known Member

    Hi All

    Okay starting off with a totally separate question about ducting. Does reducing the size from 6" to 4" do anything to the overall fan system?

    Back to the actual question
    Does anyone have any experience making a window vent for the exiting growroom air? It looks like we can buy one for the window for $65 dollars. This seems like a pretty steep investment.

    We were thinking about a buying wall vent that has the flapping lid:

    Then cutting a hole into pink insulation foam that has been sized for the window: upload_2017-9-7_9-51-43.png

    And work to ensure it is a proper fit to reduce heat loss from the house. So it ends up looking like a cheap version of this:

    Thoughts / suggestions / Pictures would be great!!!


    mtndew4lyfe Well-Known Member

    Yes I've done exactly that to vent my rooms you can use chaulk around both the outside and inside of the board insulation to completely seal it off. I'd also suggest putting a filter on it to keep contamination and smell down. Yes going from 6" to 4" will cause a pressure increase. You can do it, it shouldn't cause any issues, but why not just stick with 6" all the way out?
    Mass Medicinals

    Mass Medicinals Well-Known Member

    Filter: We have one it has not be set-up yet as

    Can chaulk be easily removed? We don't want to apply something that is permanent or will damage the window.

    We will not reduce the wall vent. The fan is 440 CFM, so we probably shouldn't do anything to increase the suction :)

    WeedFreak78 Well-Known Member

    That exactly how I made a vent for a basement window. I just taped it in place. In a double hung window you could get it to just wedge in if you took your time fitting it.
    Mass Medicinals

    Mass Medicinals Well-Known Member

    Wow so we just tried the fan. Without any ducting attached and on the lowest setting this thing sounds like a small jet engine. The 440 CFM fan is not exactly quiet. :)

    We'll try to have pictures tomorrow. Didn't get to the building store today. We were working on plant training and watering still takes FOREVER to mix and administer...

    stoned-monkey Well-Known Member

    amazon has all sorts of vents including the one pictured for less then half that price.
    rubber bulb seal like.... rubber.jpg

    could work and make it easy to remove. also duct insulation(old blanket and tape, the pink stuff like what's in most walls, etc.) can quiet the fan down some, and when it has ducting it will quiet down a little more.
    second the filter/screen, if not for smell then for bugs.
    6"-4" I have this (the whole in the brick wall was already 4") no problems at all.

    a thought pvc or ridged duct that comes out and turns down (keep rain out) with screen/filter attached. cheap and easy.

    ANC Well-Known Member


    T-Bag Member

    moving from 6-4 is going to greatly constrict your airflow... Also window box is the way to go. Use a piece of plywood to cover the window from the inside then cut a 6 inch hole and crack the window and put some blinds in there or frost the window so you cant see in and youre good to go.
    Mass Medicinals

    Mass Medicinals Well-Known Member

    Thanks again for the help. Here is the window vent in all her glory. We went with a foam sealant. This was selected because it is reliable and inexpensive. There are also many products that safely and effectively remove it. All in all it ended up costing a good deal less than the all metal version in the original post.


    Happy Growing!!!

    T-Bag Member

    Nice I like the foam, seems like it seals nice! I need to redo one of mine and make another one in another room. I made one when I first started and needless to say Im a LOT more handy than I was 4 years ago. Its funny looking back at the things I did then, Im sure 4 years from now Ill be saying the same shit hah.
    Mass Medicinals

    Mass Medicinals Well-Known Member

    So we didn't have a drill. Just a 1.5 inch box cutter. So cutting to size and making a circular hole wasn't easy, quick or clean. We also had to take breaks sweeping up the pieces that came off the insulation.

    Having those tools will make this much faster and cleaner.

    T-Bag Member

    A knife is the best way to cut that kind of stuff, a drill or saw wouldnt help. Thats why sealant or tape comes in handy.
    Mass Medicinals

    Mass Medicinals Well-Known Member

    We were told to be careful about using knives as the insulation has chemicals. Which then made us a bit paranoid about what we were introducing into the house. We're not crazy but handling things that may cause cancer isn't something we want to do that often. Hindsight we should have cut to size outdoors, and used gloves...

    T-Bag Member

    Yeah you dont want to breath that shit or get it on your skin it will burn... I try to cut everything outside so I dont have to clean it up :P Dont forget tho we are made of chemicals and so are plants. I wouldnt worry, it probably doesnt cause cancer unless your in Cali.
    Mass Medicinals

    Mass Medicinals Well-Known Member


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