I want to find a really really quite (so it will be impossible to hear) fan to ventilate my micro-grow and it also has to be as cheap as possible. I thought maybe I could buy a little CO2 tank and just release a little CO2 every X minutes, is a good idea or a very bad idea? Is it dangerous? Suggestions for cheap ventilation systems? My growing space is about 1.5 feet by 5 feet.
C02 with ventilation is a waste. The 6" duct booster fans from home depot are pretty quiet and are about $30. Not very strong but would work for a micro grow. What lights are you running?