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    Lightproofing ventilation

    Looikng to make a light trap/stop light leaks from a 12' max fan with the least amount of cfm loss possible.. The fan is between two flower rooms, sharing an ac. I looked into dust shrooms but they are pretty expensive, but that might be the best route. I would definitely need two, because I...
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    Been lurking. Finally joined. Lots of good farmers and breeders. Ive done LP aero, MPB, UC, Coco, dirt Heres a +1#er I did a while back See ya round