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  1. J

    Ducting Co2 from outside is it likely I'll be detected?

    unfortunately I live in a state which isn't legal so I have to be very careful when growing my meds I want to use co2 but the amount of heat I won't be able to deal with and bottled co2 isn't an option due to size of room. I'm thinking of using a propane hot water heater mounted outside. I can...
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