Air circulation & the dark period

[Buckshot]

Please bare with my newbishness..........

K, you're growing in a closet and you get some black plastic (or something to cover your door) for the 6 or 12 hour dark period. It will cut off any little bit of light that might interfere, but it will also mess up the air circulation. What's the best way to make sure your plants get all the uninterrupted darkness they need while at the same time keeping the air flowing? Many thanks...

[MightyBuddha]

At night you probably don't need to worry too much about airflow as the lights are off. If you can design a little 90 degree elbow of black pipe you can hook that up to a fan. The 90 degree angle should stop any light from passing through the pipe.

[Buckshot]

Thanks mang