Airsoft Sector

The idea is very simple. A fan, inside your mask to prevent fogging. Now, as many of us all know, they already exist. Yes, they do, they are designed to suck the air out of your lens. Lets face it, almost all the moisture in you mask comes from you breathing. So, what better place to put an output fan, than right in front of your mouth? Here is a simple home mod you can do with a simple understanding of electricity.
Below is a picture of my Dye Invision I3. Great mask.

So, the problem is, no matter what mask you buy, the venting will always impair airflow. So, this simple mod is the solution:

Here is what you'll need.
1. A small fan. I recommend a 40 mm. You can buy one at radioshack for around $13.00 dollars. Now, if you don't like to be a sucker, you could go to a computer website, and browse through their extensive selection. For example; fan.
Now, you'll also need/want a micro switch. Also available at radioshack, this handy little device will cost about $3.00, and will let you toggle your fan on and off. It isn't completely necessary, but the alternative is (un)plugging your fan from a battery everytime you want to turn it off/on.
The next thing you'll need is a 9 volt battery holster. These are pretty common, I got mine out of the back of an old baby monitor. They're the little leather things that connect to 9 volts and have 2 wires going out of them.
Lastly, you'll need a 9 volt battery. Anything will work.

So, now we need to put everything together. First off, you need to know how to sodder. Pretty simple, if you've ever taken an electronics course in Boy Scouts, you'll know how to do this. If not, ask your Dad, or some other crafty person you know. If your fan came with a wire harness, you can cut that off, it's not needed. The fan should have three or two wires, depending on where you buy it from/what it was intended for. You need the red, and black wire. If the fan has a yellow wire; like the one in the link, cut that too.
So, you have a battery harness, a micro switch, and a fan. The switch should have two little teeth coming off of it. You need to sodder either both the red wires, or both the black wires to the teeth on the switch. One per tooth. It is very important to follow these directions. Do not mess this up, or you'll form a parallel circuit. This will basically try to discharge your battery when the switch is off, which will cause the battery to get very hot, and possibly blow up. Very bad. If your battery is getting really hot when the switch is off, you did it wrong!!!!!!!!! Take the battery out now!!!!!!!!
So, reviewing. We have the battery, with the harness wires going to a switch. The color of the ONE wire from the battery matches the color of the other ONE wire soddered to the micro switch. Now, taking the other two wires, be they both black, or both red, sodder them together. They should not be touching the micro switch.
A quick note, I would strongly recommend putting some heat shrink tubing on one of the wires before soddering it to another. This way, when you're done soddering them together, you will have a protective layer over them to protect from coming undone.
So, if you did everything right, the fan will turn on when you flick the switch. Again, if the battery gets hot when the switch is off (or on), you probably messed it up. Now, we need to mount it in your mask.
I used tie wraps on the four corners of my fan to mount it right in front of my mouth. I then used two more to hold the battery in. Then, find a cozy place to put your switch, so the wires or switch won't catch on anything. I put it along the buttom left of my mask, so I could flip it with my free hand. (it's different than the pic, I changed it a bit later.) It's up to you. Just make sure the wires aren't going anywhere. Twist them up to keep them together.
During the process of mounting, you should keep on trying on your mask to make sure everything fits right, and you don't have a pointy tie wrap cutting into your cheek. Also, I'd recommend using a tie wrap that will matches the outside of your mask. Black, in other words.
Note: If you have a really tight fitting mask, like the Empire E-vent, Vents, etc. the fan may be to close to your lips, and the blades can whack your tongue. Ouch. Ehh, it's actually just uncomfortable, but you don't want that. Bottom line, you may not want to do this mod.
Congrats, you now have a personal fan that really sucks! Literally! It will eliminate any heat buildup in your mask, and you can focus on being shot, errr, shooting people. You'll notice and really appreciate the air flow. It's like a breeze that just keeps blowing, but only for you, cuz your special....
Enjoy. If you have any questions, feel free to ask, and I'll try to guide you through it. Patent Pending, Craig Niland, 2006.
Enjoy again.