Duct fan covers

Discussion in 'Grow Room Design & Setup' started by hubba, Feb 7, 2018.


    hubba Well-Known Member

    Hey guys, I'm trying to get back into the hobby after quite a few years. I have an old play house that I'm trying to conversation to a grow "cabin". I'm having some issues controlling temps inside with my 1000w HPS. I bought an 8" axial duct fan to push the hot air out but I think I'm gonna need to grab another fan to use as an inlet. I have the current fan mounted straight up to the wall so the fan is exposed on the outside and LOTS of light comes in through the opening.

    This isn't a huge issue currently as I'm still vegging and the existing fan is mounted up high. However the new fan will obviously be mounted down low and I'm worried about my animals or pests coming into contact with the fan.

    I was wondering if any of you fine growers could recommend a cover of sorts for the existing fan and future fan that would limit light and keep animals/pests away from the blades. I haven't bought the inlet fan yet but I'm leaning towards the same 8" ipower axial fan off of Amazon. Any input or recommendations are highly appreciated.


    Cold$moke Well-Known Member

    Look up how to build light proof vents

    Basically a box that has 3 90 degree turns in it
    If you need i can draw a pic
    Bunnybrew likes this.

    Cold$moke Well-Known Member

    Is smell going to be an issue?

    hubba Well-Known Member

    Smell is a non issue, I'm really just worried about light leaks and animals/pests getting chopped up by the fan. Looking into light proof vents but haven't seen what you describe just yet.

    Cold$moke Well-Known Member

    Give me a sec ill draw it up

    Super simple and it works albeit a little bulky

    But it is light proof

    Cold$moke Well-Known Member

    Here you go this should give you an idea

    Of coures you can add things like dampers or flaps with a spring to help seal in the smell if needed.

    I made one for a passive vent not hard just takes up a small chunk of wall

    Cold$moke Well-Known Member

    Basically light wont go around corners and it takes about 3 bends to kill the light .

    Plus i painted the inside with flat black :)
    eyderbuddy likes this.

    Cold$moke Well-Known Member

    The same thing can be done with pvc or metal ducting but they are more expensive then throwing some wood together.

    Another option is light proof vents for dark rooms and photography

    These are a nice way to go i just didnt want to wait for them cause the size i wanted was back orderd

    They are not too expensive either
    eyderbuddy and Bunnybrew like this.

    eyderbuddy Well-Known Member

    good stufffffffffff thanks for the idea!

    GreenLogician Well-Known Member

    You'd pull more air using both fans as exhausts, and then having big passive intake holes. But that doesn't help you with the light leak thing.
    I bought a few square meters of this black filter stuff for airconditioners, sort of a spongey sparse fabric.
    I zip-tied pieces tightly over each end of a very short piece of duct.
    I made two of these and placed them in my tent's bottom vent ports.
    This has greatly increased my passive intake size, and blocks light AND dust effectively :)

    hubba Well-Known Member

    You wouldn't have a link to this magical black filter by any chance would you?

    Flagg420 Well-Known Member

    just build a chimney.... like others said a few bends and the light cant get thru...

    somedude584 Well-Known Member

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