I have to be 100% LIGHT TIGHT!

Also, what type of vent do I use for the intake hole? It's 4" in diameter.

Thanks in advance!

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black nylon prolly i just have black plastic covering it at an angle so it lets air out from the bottom side but blocks light

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R.C.C (Rollitup CFL Crew)-mistaphuck. http://www.rollitup.org/grow-journal...nk-indica.html <thats my pink indica

you-could-use-dryer-vents-in-side,light-wont-go-through-the-vents-and-nothing-will-block-your-air-movement.

oh-yeah,u-have-to-keep-the-vents-high-and-have-them-bent-a-little-bit

There is no kind of screen that will be light tight. If air can go through so can light.

Thats the bad news.

The good news is that light traps are easy to build out of common materials.

A piece of cardboard box, some duct or masking tape and some flat black spray paint are all that is needed.

Construct a box with a set of baffles (at least 2 90 degree bends) in it so that air can come around the baffles but the light cannot.

Connect the box to the outside wall either inside or outside.

Here is a pic of a light trap that I built into a hatch cover. You won't need one that big for a computer fan but I hope you get the idea.

Attached Images

	Flowering Room Doors (2).jpg (29.4 KB, 66 views)
	Flowering Room Doors (6).jpg (34.9 KB, 57 views)
	Flowering Room Doors (4).jpg (40.9 KB, 52 views)

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http://www.rollitup.org/grow-journal...ydro-grow.html

Kind Treatment = Kind Bud

If you have access to old computers try getting some ducting that connects to the fan system. Dell has some nice green ones that work great after a little modding. I am not sure what other manufacturers use since I only purchase Dells.

What kpw555 said! But those pix really don't help explain much, bro! The trick is to let the "Light Trap" act as a passive intake and have another one on the end of your exhaust duct. Cardboard and duct tape work just fine, "Black-board resurfacing paint" really sucks up the light! The idea is to get the air flowing through a long, narrow, slit and channal it through a series of "S-turns" to "eat up" all the light. Paint the insides with, at least, flat black paint. This sucker works - ZERO LIGHT - trust me!

Everything worked out for me with those traps. Waiting for the paint to dry now!

Thanx again to all yall!

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There you go!

Well, not 100%! Theres a little light seeping out the back. So what I'll do (since I already painted the inside), is repeat this same method on the outside of the box. However, what do I do for the exhaust of the cool tube? Theres a fair share of light glowing the closet. lol Also, temps are not sdupposed to reach no higher than what?

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