When it comes to ducting, the number and sharpness of its bends factor into the airflow resistance. Adding components like ducting and carbon filters will reduce fan performance in your grow space which affects the fan size you need. The next step is to increase your base CFM by your accessories’ efficiency percentages. Hold on to this number, as you will have to account for the ducting, carbon filter, and other accessories you might add. Since a grow space’s volume is also the required CFM to ventilate it every minute, this grow tent’s base CFM is 72. Multiplying the dimensions together would equal 72 ft 3. Here is what the formula looks like:įor example, a 48”x36”x72” grow tent converted to feet would be a 4’x3’圆’ grow tent. This will equal your grow space’s volume, with the required airflow equal to this figure in cubic feet per minute, or CFM. Then multiply its length by its width and height. Most grow tents’ measurements are given to you in inches, so convert your space’s dimensions from inches to feet. To find the amount of airflow needed for your grow space, first find its volume in cubic feet. This figure is measured in CFM or cubic feet per minute. Exchanging stale air inside with fresh air from the outside of your grow space is vital for optimal plant growth. There are various sizes of grow spaces, each requiring a different amount of airflow to ventilate them. Your carbon filter will also perform better if it’s positioned at the highest point. Since heat rises to the top, exhausting that hot air at that point will make the ventilation process efficient. We recommend setting your extraction fan at the highest point possible. In this case, you may set the fan and/or filter outside of your grow tent. Your ventilation system can be configured in at least 4 different ways to fit your needs.įor example, your grow lights might get in the way of your cooling equipment. Both can be situated in any order within the ventilation chain if air is being pulled out of your grow space. A typical setup places the fan and the filter inside, which makes it easier to manage while dampening the fan noise. There are many ways to configure these components to bring airflow into your grow space. They are also used to trap pollen and spores, keeping the air clean for growers with allergies and breathing issues like asthma. For growers who deal with especially strong aromas, carbon filters are a must. Also called carbon scrubbers, this tool pulls the smell of plants from the air, catching the odor to neutralize it. To prevent odors from spreading out towards your garage or closet, you will need a carbon filter. Its size and bends affect how your inline duct fan performs but more on this later. They are usually made of aluminum but are occasionally multilayered for extra protection from tears. Duct Tubesĭucting is clamped or taped onto your inline duct fan, acting as a channel to route the stagnant air away from your grow space. In ventilation systems using passive intake, inline duct fans also act as a vacuum that brings in air carrying fresh CO 2. The location of your grow space will affect how hard your inline duct fan will work, which is largely dependent on how well your grow space is insulated. Using an active exhaust fan to bring in cooler air will help you regulate the internal temperature. So, it’s important to have a way to manage your grow space’s climate in the form of an inline duct fan.īecause you will be growing in an enclosed space, it will be hotter than the environment outside. Furthermore, unchecked heat and humidity create poor growing conditions where your plants are unable to absorb water or simply cannot survive. Slight changes in temperature and humidity can greatly affect your chances of producing a successful yield. These are the three vital components you need to create a ventilation system:Īlso called an extractor fan, an inline duct fan is used to expel the hot and humid air from inside your grow room or tent. This guide is written with the assumption you have already chosen or purchased your grow tent but is also applicable if you are operating in a grow room. The following guide will show you what you need to know about setting up your ventilation system. Refreshing the air inside has the added benefit of removing strong odors. At the same time expelling the air inside will keep temperature and moisture build-up under control, preventing mold and mildew from forming on your plants’ leaves, inhibiting growth. By supplying fresh air from outside your grow tent, you provide CO 2 for your plants, driving their photosynthesis. Ventilation is a vital factor in your plant growth.
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