co2 is 1.5 times heavier than air. and a 10% concentration is considered lethal. you should not be using it in an enviroment like you are describing.if you have a garage do it there or on a deck outdoors. those 2x20 cm fans are probably located high on the wall so in effect they are removing the air from your basement as the co2 settles on the floor slowly filling the room.
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