Passive air-intake - how to make it light-proof?

Hi folks,

as I am about to cut into my wall to make the passive air-intake it hits me:
How in the hell do I get this light-proof ?!?

The passive intake is to be made at the ground level so that cool air flows in and the exhaust is located at the ceiling level to exhaust the hot air.

I wanted to simply make a cutout and then install a pollen filter (so that air is filtered and no pathogens/insects/etc. can enter through the passive intake).

But the pollen filter does not block out the light...

I saw a solution with an active air-intake where they simply used an air duct hanging from the ceiling and releasing the air on the ground level of the room.

But with a passive intake?

Help appreciated!

/Edit
My best idea so far was to place the passive-intake "window" a little higher above the ground level and then have a short piece of air-ducting on the inside that dangles down like a flacid member. Guess through the angle some light would be lost but I would be worried that some light still shines through unless I place the passive-intake a good meter above the ground...

I stand ashamed for not using the search function properly and making a big fuss out of something so simple ....

Sorry guys and thank you!

Here is my light trap thread.

https://www.icmag.com/ic/showthread.php?t=224159

Here is what I posted in another thread...super easy, cheap and works great.

Another option that only costs about $20 is two offset registers. Paint the inside wall with flat black...



Worked great for me and my offset was only about 2'...

Aw man these solutions are awesome!!!

I currently favor Ich's solution because I have cut-offs from the wood construction left over and they should allow me to make 4 such light traps without additional material (black paint should be around here somewhere, too).
Vta's dual wall seems like the most "elegant" solution come to think of it ...
But I don't have the space nor material for a double wall.
Yet if done like this, you basically never will have to upgrade your intake vent because the wall functions as a lung room. If you ever need more intake, you just gotta increase the vent size and you are done.
The only drawback I see is the added material cost.

Cool cool cool

thanks all!