you def need some form of vent...more for the heat....but just think when there is no ventilation...NO CO2! so you plants choke when they use it all up and dont have anything to replace it

a good fan will replace the air in the whole cab 3 times a minute or 1 time very 3 minutes, i cant remeber off hand
oturbojoeo4o Reviewed by oturbojoeo4o on . closet grow/ possible with no ventilation? ive succesfully grown with cfls in a closet before, but id like to upgrade to a 400watt or so, hps light. do any of you guys think that a closet with plastic on the walls, could withstand a 400w hps without ventilation? ( i would be opening the door for fresh air every hour or two, and have fans running inside ofcourse) i'd be happy for any feedback or advice:smokin: Rating: 5