blocking light from veg cab to flower cab

hey all,started the framing of a veg/flower cab and trying to figure out how to block the light from the veg section to the flower.the veg area is down bottom with the flower on top.my exhaust fan will be in the flower cab part with the incoming air/fan in the lower veg area.i need to get a hole in the floor of the flower area(which would be the ceiling of the veg cab) to allow air to get from the veg to flower.how do i block the light?any ideas?

Hook up a couple 90 degree PVC elbows into an S shape, maybe add a couple inches of pipe to the outlet on each side, and paint the inside black. Boom.

hey,thanks brother.i think im going with a booster fan with a little length of ducting and a 45° or two.just saw your thread,nice work!!

That will definitely work too. Just make sure you use the expensive ducting, or paint the inside black. The cheap stuff will leak light. Thanks for stopping by my thread!