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Cheap easy light trap for venting.

Ichabod Crane

Well-known member
Veteran
I just made a new light trap intake vent for my flower room. It is easy to make and only uses the following.

Tools: Razor knife, Speed square, Tape measure, Pen, Hot glue gun.

Materials: 1/2 inch foam, Metal duct tape, Hot glue, Black spray paint

OK to start you need to decide how big you want it. Mine is 1 foot by 2 foot. I will not include dimensions as this is pretty easy to do once you see the pictures.

First you start by making the base it is hot glued together and looks like this.
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Once it is glued on seal it with the tape to block light from getting through the cracks like this.
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Then you attach the ends and make a box like this.

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Next cut four strips that are slightly bigger than half the depth of you box. They will be installed like this picture shows.
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As you can see they are staggered up and down. Because of this the light can not get through the trap. After you have them cut you need to measure your distance for placement. Mine are 2 and 1/2 inches apart starting 8 inches from the end.
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Once you measured them out install the two bottom pieces with hot glue on the bottom side only. It will look like this here shows.

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As you can see I have marked the sides for the other two pieces. These two will not be glued but instead taped on the ends. I find it is easier to put tape on them and bend it back like this.
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Then you place them in the box and swing them in place and press the tape down snug.
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Next you tape all the pieces to make the box light tight like this.
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Once you have all the seams taped you paint the inside flat black.
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Now it is time to install the vent. I start by marking the wall for the vent by placing the vent next to where I want it to be. Then I just mark it out.
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Once this is done you need to cut a hole in the wall. Using the now marked wall I keep my cuts just short of the edges of my vent box marks. Remember that eight inches when I laid out the center dividers. Well that is how much I can cut out now. My walls are made with the same foam so the hole is easy to cut.
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I cant show the hole cut out as this room is in the dark phase. here is a picture from the inside of the vent below this to show you what it looks like on the inside.
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To install this I simple run glue down the edges and stick it to the wall. It is important that the side to be glued to the wall be flush. When I made this box I had one end that was sticking up. I simply took my square and a knife and cut it flush.
before
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after
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After it is glued in place I run tape around the outside edges. so it looks like this.
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One thing to keep in mind when making this is that the cuts don't have to be perfect. They will get covered by the tape. Best of luck with your light proof vent.
 

Warped1

I'm a victim of fast women and slow horses
Veteran
That's slick Ich, nice job, it looks like it should flow really well.
 

Ichabod Crane

Well-known member
Veteran
Just paying back all the info I stole from this site for my grow guys. I can finally get into my flower room so I took a picture of the inside of the room showing the vent.
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As you can see I use one vent for my electric cord into the room.
 

silver hawaiian

Active member
Veteran
Good stuff - I've got a hobo-lookin' setup similar to this, but definitely not as well-constructed, and without the baffles inside

+1
 

Ganja baba

Active member
Veteran
nicely done mate ,

a quick and cheap way to do the same thing is to take some flexi ducting and twist it , this creates a light trap works well on tents in stead of leaving them flaps open .
 
That is OK I did it to pay back all the ideas I stole from here for my grow. Just glad it can be used by some here.

Thanks everyone for the good words.

i know man, i've read enough of your posts to know you have the true spirit, ...which is why i wished i could rep you, ...not because reputation is important but because acknowledging that spirit IS important.

...i'm not as new as my join date would make it seem.

peace, SOG
 

soursmoker

East Coast, All Day!
Veteran
dude for some reason I cannot understand how this works. I've scrolled through all the pictures and read all the captions like three times now. I think confused about the whole in the actual vent. did you skip pictures for that step? and how exactly do you mount it? with the staggered walls directly in the middle of the hole in the wall? I'm sorry I feel so slow right now... lol

edit: nvm I think I get it now. im sorry, feel free to call me whatever names you guys want lol
 

Ichabod Crane

Well-known member
Veteran
Awesome idea ichabod :good:. I'd rep ya, but I can't.......

That is OK I don't mind. I just posted this because I know a lot of people don't have my $140 circular saw but they can cut foam easy enough. And it is quiet and less messy to do in foam.
 

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