Vent light trap

Nice!!

That should be helpful to alot of people.

Haha I Googled 'light trap' and this was the second hit. Indeed, now I have an illustration I can wrap my head around. =)

I know this is an old thread but its all I can manage to find on light traps. My question is how is the illustration worth a fuck????? the part that is blocking the light,,, far right of pic,,, is suspended in air!! Is there a way to build a light trap for a big window box fan?