Even in a sealed room you have to change the air to get the oxygen out and let some Co2 build up again, so I think that if you have a leak of about 20% of the air it should be all right. The best way to know is to test it and if it is possible to get a Carbon Dioxide Meter this will tell you if the room is ok.
LuciferN Reviewed by LuciferN on . co2 question got the co2 boost setup how sealed does my room need to be?? can only get about 80% sealed if i go more it gets to hot does it still work with the co2 falling over the plant or does there need to be buildup of co2 in the room for it to work thanks Rating: 5