As shown in this video, there’s a simple mathematical formula to help you conclude the proper size of fan and carbon filter you will need for your garden space. In order to determine the correct sizes, simply measure the length meter, width meter and height meter of your grow space and multiply them all together. This calculation will give the total cubic meters (m3) of your garden area, which will help you decide the fan and carbon filter size that will be most effective. Formula for calculating the active volume of your grow space: Length meter x Width meter x Height meter = Cubic meter (m3)
The sizes of carbon filters and their corresponding fans are listed by cubic meters/second and diameter. So, if your grow room calculates to be approximately 12 cubic meters in size, you will need a carbon filter and fan setup that is designed to handle that amount of volume or more.