That is an awesome idea. I have to try this out. I can use one of these really bad.

+1 for you
TheGanjaKing420 Reviewed by TheGanjaKing420 on . DIY LIGHT TIGHT AIR VENT it was cheap and easy to make got the idea from someone around here, but slept since then. another great thing about them is they take up way less room than the ones with the pvc piping all you need is a razor,some good glue(i used a modeling glue), flat spray paint for the imperfections, and some elmers black foam board. all items can be gotten at local wal mart near the arts and crafts and school section for afew bucks apiece(mine cost about $10). mine measures a total of12.5"L x 4"W Rating: 5