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Ok I recently started using CO2 my room is tight. Anyways to maximize the CO2 falling over my plants I’ve got the Can filter on the ground with the fan on top pulling the bottom air rich in CO2 up and tossing it back over my plants. Ok all works well way less CO2 being used etc but I was just thinking of me putting a hand down in that fan and getting chopped up. I’ve considered cutting a piece of field fencing to cover it but I was hopeful there is a more elegant solution? If anyone has any ideas, horror stories or what not to dos, please let me know. Thanks tons,  growers love and hoping to keep all 10 fingers.