Any ideas how to build a light trap for a grow tent?

I used an intake fan to avoid negative air pressure inside the grow tent for my last grow. It worked fine but it also increased the dust buildup inside in the tent.

I have tried to use the ventilation opening instead of intake fan and it works quite well with a filter mat as a particle filter in front of the mosquito net in the ventilation opening. Unfortunately the tent is no longer light proof since I can’t cover the vent opening without creating to high negative pressure.

Could you recommend some kind of “light trap” for the ventilation opening in grow tents?

Could you use another piece of ducting and loosly coil it?

Yes, I think that could work. I will try that. Thank you BigEasy1!