CFM and You

Fans, Filters and how they relate to your garden.

There are many issues that can throw us a curve ball in the grow room. Environment is certainly one of the big ones. We know when it's too hot or too cold. We know when the humidity is wrong. But what can we do about it?


Depending on your garden size, and the natural condition of your outside air. It's certainly possible that at some point, you will find yourself buying air conditioners and dehumidifiers. However, weather you end up needing these items or not, it is almost certain you will at the very least be buying fans for your grow room. Fans will help us with a few things. Wall mount fans like the Hurricane 16" are not only great for circulating your air and ensuring that every cubic foot of your room is similar. But they also provide something for your plant to resist, which will in turn strengthen overall stalk girth and density.


But what's the best policy for ensuring we have the best air quality in our room? We know that most plants tend to thrive in 75F and 60% Humidity. So lets first start off with the idea that the air quality outside is already perfect. In that case, all we need to do is add exhaust fans. So for the sake of example, lets make a pretend room. Our fake room will be 10'x10'x8'. Next we want an idea of how many times we want to cycle the rooms air. Here's the calculation for that.


  1. Get the total cubic feet of the room. In this case 10x10x8 = 800.
  2. Standard cycle timing is one time per minute to every 3 minutes. So if we can't every minute, we will need a fan that is at the very least able to push 800 CFM. This Can Pro 8" would do nicely. If we want less flow, divide by the minutes. 2 minutes would be 800/2 = 400. 3 minutes would be 800/3=270.
  3. If we are going to add on a carbon filter, double whatever your first number is. So, if we were going to cycle every 2 minutes with a carbon filter. We would need 800 CFM.



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