Grow Tent (Intake)

What can I put in my intake vent holes that will let in air but not let in the light?

Intakes are 6"

a 6" pvc elbow maybe?

Yah I was thinking about something like that, but I would prefer a vented cap of some sort to keep out large particles like cat hair etc.

put some pantyhose over the pvc elbow

I saw someone with one of these on their passive intake inside their tent:

http://www.improvementscatalog.com/home/improvements/75991-indoor-dryer-vent.html

This one is for 4" ducting but I'm sure you could find 6" easily enough.

You don't have to put water in it, but you'd have that option if you need/want to raise your humidity a bit during vegetation. Could also fill it with a desiccant if you wanted to lower humidity.

The water would tend to filter out particles in the air as well.

Could DIY something similar with a bucket and a little 6" ducting.

I thought it was a cool idea anyway so I thought I'd share.

what kind of tent do you have? most of them have passive flaps on the bottoms.

Dr 120 and it does have the passive flaps, however when I open the flaps it leaks light. I want to stick something in my bottom two 6" Vent holes so that I don't have to worry about opening and closing anything and so that there is no light leaking that could put stealth and th dark period at risk.