Making it light proof...

So I installed some fans onto my grow box today, however that leaves some HUGE light leaks in the side of my box.

I'm looking for ideas on how to cover the fans to not allow light leaks, but still allow fresh air into the box.

Right now I've just got a big towel draped over my box with the towel being far enough away from the fans as to allow air to still circulate.

I'm not really after stealth with this grow, so it can look funky... that'd be okay - I just don't want my girls to suffer because of not perfect dark.

Ducting helps; put some flexible ducting over the fan and turn it down to the ground. It wont get rid of all the light but should get rid of most of it. You can incorporate screens in there as well to achieve maximum stealth.

Heres what I did in the same situation. I ran about 3' of 6" tubing from the fan. I bought a 6" -> 8" reducer (looks like a cone that is 6 on one side and 8 on the other) from home depot. I found an old speaker box in the garage,and wrapped the 8" side of the reducer with fabric i took from the speaker box. I plugged the 6" side of the reducer into the end of the tube,secured it, and no more light leaks but air rips through it no problem.