You will need ventalatoin of some sort or co2 one of them will be needed though you didnt mentoin if you were in a sealed room or if they are getting fresh clean co2 from somewere as i presume they must be. plants need co2 to grow so if they arent getting much now you will need to fix it so they dont die if the 9ft squre place is a room ,is there a vent? anyway to answer you questoin yes you will need ventalatoin from some source.Be safe the postman.
postmandave Reviewed by postmandave on . New grower needs help!!! 3x3 grow room w/ 400w hps and mh conversion bulb hey all, this is my first indoor grow with about 9 square foot using a 400w hps...right now i'm vegging and all seems fine, do u think ventilation will be required or CO2 for such a small space, currently i'm using a small fan which seems to be working alright and the temp has not went over 76degrees...i'm hoping that i can get away with no co2 or ventilation work for such a small grow of a few plants...thanks in advance Rating: 5