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Wardawg
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I call this the IRON LUNG which can save you from buying separate ac and co2 for each room when running a flip flop or multiple rooms so how it works is either build or use a room that’s central and I seal it up tight and put my ac co2 and dehumidifier in it and in my rooms I’ll put a carbon filter up high somewhere and run that to the HVAC room or the lung as I call it and then have a intake around or just above canopy level for good co2 dispersion so both rooms have a out with carbon filter going in to the hvac room and intake from the hvac room both in and out and you then can connect your fans on the in and out to your environment controls tempastat thermostat or timer and co2 sensor you can also get a automatic damper on a timer to switch between the rooms so all the air that comes in is clean conditions and full of co2 the only drawback to this system is control night time temps in your room will have be done independently