Ventilating Your Medical Marijuana Garden
A professional intake fan will replenish th CO2 in your grow room.
(Click to enlarge)
Pull a string from the intake point to the point of exhaust. Preferably, this string would pass through the majority of your plant’s canopy. 
Ventilation systems in an indoor medical marijuana garden are as important as your lighting and nutrient regiment. A proper ventilation system will help maximize your garden’s potential. In an indoor garden environment there are 3 major reasons for installing an efficient ventilation system.
#1 Temperature Control
In most cases, heat tends to be an issue with an indoor medical marijuana garden. To remove excess heat, an exhaust fan is utilized.
Some gardeners prefer a fan to run constantly and some go for a more automated approach with atmospheric controllers or thermostatic fan controls. Gardens with multiple lighting systems may have specific fans designed to “air cool” their lights. These fans are usually set up on a timer to turn on at the same time as the lights.
#2 Humidity Control
Most gardeners don’t realize that their fan serves this purpose because as the fan removes heat it also removes humidity. Excess humidity in indoor garden environments can cause mold, mildew, stunted growth and stagnant air.
For most applications, a good exhaust fan set up on a timer or humidistat is more than adequate. Depending on where you live or the grow room’s average humidity, a larger fan designated specifically for humidity control or a dehumidifier can be used. It is important to remember that plants transpire moisture during the dark cycle too, so removing humidity at night is also very important.
#3 CO2 Replenishment
Plants “breath” CO2. In an enclosed room, a plant can eventually use up the CO2 found in the air. It is important to replenish the atmosphere with ample CO2 for the plants to maximize photosynthesis. If you are not artificially supplementing CO2 in your garden be sure to run a fan continuously or on a cycle, preferably every hour, to ensure fresh air is getting into your garden.
For a standard ventilation system, the exhaust and fresh air intake should be set at opposite ends of the garden. Generally speaking, a fresh air intake should be lower in the garden (near the floor) and an exhaust should be placed up higher (by the ceiling). An intake can be powered by a fan or a passive system. A passive system relies on the negative pressure created by the exhaust fan to draw fresh air through an intake opening.
Like water, air flows to the path of least resistance. So when setting up your grow room, a good rule of thumb is to pull a string from the intake point to the point of exhaust of your ventilation system. Preferably, this string would pass through the majority of your plant’s canopy.
Just like any system within an indoor medical marijuana garden, the ventilation system will take a little experimentation to perfect. Temperature and humidity monitors, along with atmospheric controllers, can make the job a lot easier, but good results can be had with a basic exhaust fan and some know-how.
Check out this creative ventilation set-up
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Tuesday, 21 June 2011
