Light Safe Air Exchange Between Flower/Veg

[ZukisGarden]

Hey all, with the summer months coming up I want to make sure my temps are right where I want them.

I have an A/C cooling my flower room, and what I want to do is share that cool, fresh air with my veg room. They are simply separated by a single wall. What is the best, light safe way to do this? I have been trying to find what other people seem to be using but with no luck.

Thanks!

 

[vta]

I have used ceiling registers with great success.

Offset (one high, one low) them. I painted them flat black as well as the inside of the wall. Negative pressure pulled the cool air in. Zero light leak.

 

[ZukisGarden]

I feel like this would need to be closed in order to be light safe, tell me I am wrong?

I had thought of running some ducting from the lower half of the wall up, and put a booster/inline fan on the end to suck in fresh air. Somewhat light safe, might be good enough?

Thanks for the reply vta!

 

[Granger2]

Paint inside of duct flat black, use 3 90 degree turns. No light leak. Allow for 90s adding significant static pressure. Good luck. -granger

 

[J-zee]

Go beteen studs one vent low and other a few feet up on other side.
If ur a studed wall of course, after that, its black paint and a few 90's for u...
Light leak will cost u if u dont get it pitch black