Because hot air goes up you need to put the exit valve in the top of the growing area and the intake should be somewhere near the bottom. Don't be unaware that the intake should be somewhat larger than the exhaust exit; This will let the passive air come in with more ease and will bring the correct amount into the grow room.



Make sure this exit exhaust fan is rated for high CFM under pressure.

Fans for ventilation will have a CFM rating that tells you how many cubic feet of air the fan moves per 60 seconds. To be ideal, the exhaust fan should be able to circulate the air from your grow room at least once every five minutes. To get your grow tent or rooms total cubic feet you would multiply the width, height, and depth. the you would divide the number by 5 and now you have the minimum CFM fan rating that would be a good fit for your grow room.



Circulation of air also brings a very calm breeze to your plants that is very important for strong stem, branch, and bud development.

A calm air flow will stimulate the plants by stressing it just enough causing a growth in size and strength to the branches and stems. This directly enhances the quality of buds because the plant will now be thicker, stronger and overall healthier. I've seen some of my girls stems grow to 3-4x larger than the average plant when using proper ventilation.



There you go, some great info that most novice growers will look past and never use what could have taken their plant growth beyond their wildest dreams. Don't be one who falls into this group of indoor gardeners! Your hard work should be rewarded by giving you the best buds around and you wont have to pay crazy loot for it either. Gardening your own medicine is an investment as these plants have been proven through thousands of years of real world testing, as having miraculous healing properties that will NEVER leave you in your time of need.

Make the most of your grow area and I wish plenty of bountiful harvests to you all.