When setting up an indoor medical marijuana grow room, making sure you can bring fresh air in and exhaust old air out for air ventilation is very important. The quality of air and Co2 inside your grow room plays a major role in the quality of plant life, as this is what the plant needs to grow. There are 3 major things to remember when setting up an indoor room – air ventilation, stomata and air circulation.

Air Movement and Circulation

Indoor marijuana growing can be very easy if you have the proper air ventilation and circulation, especially the ability to bring fresh air into the grow room. You will need at least one fan for circulation and another for exhaust. Most growers today use a large charcoal filter can fan for their exhaust fan as it not only gets rid of the old air but also scrubs or cleans it, removing the smell from the air prior to exhausting outdoors.

How Plant Stomata uses Air

Stomata are the microscopic pores on the undersides of the leaf that regulate the flow of oxygen and carbon dioxide. The bigger the plant, the more stomata it has to bring in carbon dioxide and release oxygen. The larger the grow room and the more plants you have, the more fresh Co2 enriched air they will need to grow fast. Keep in mind that sprays that leave filmy residues will cause the stomata pores to clog, so always make sure to spray the plants with tepid (hot water mix with cold water) water 2 days after you spray them with any kind of pesticide or miticide spray to help open the pores up.

Grow Room Air Ventilation

Air Ventilation inside your cannabis grow room is as important as water and light are to your plants growth. All marijuana grow rooms need air ventilation, which can be accomplished using a window opening or a door opening to exhaust the air out. Use a squirrel fan or in-line blower to create the air movement or to bring new fresh air into the grow room.

3 comments… add one


  • [...] add to it the need for ramps, light movers, pulley systems, sinks, drains, electrical, security, air and ventilation and everything else can really create a challenge. I am here to help!Handicap Accessible Grow Rooms [...]
  • Need help from HVAC technician. Need advise how to set up venting on a perpetual multi room system. Main room is 10x10. Splitting in half makes two 5x10's. split one 5x10 in half makes two 5x5 veg/flower closets and one 5x10 mom/clone/work area. I desire to have the option to either intake from outside air or basement air depending on outside temps. Would be nice to also be able to shut venting off and create closed system as well. Both 5x5 veg/flow closets will have Co2, carbon filters on fans for exhaust. The 5x10 mom/clone/work area will have no Co2 enrichment. All rooms will be lite exclusively with LED lamps. Environmental controllers will run the show. Any suggestions welcome. Please advise
  • If I'm running a 600w HID in a say 4X4X7 would sucking air in through a fan at a low point in the tent be enough ventilation, along with running a carbon filter exhaust? it would seem that would be plenty of fresh air,