What Size Fan For 4x4 Grow Tent

If yous are ventilating a grow tent, it'southward of import to know how much air to move to provide and adequate corporeality of fresh air. Since information technology fills upward the entire infinite, you can guess that the book of your grow tent is equal to the amount of air that needs to be exchanged. A trivial more goes into the calculation if you are filling the space with accessories. So from our total grow tent ventilation guide, learn how to discover the CFM you demand.

The Formula

First find its book in cubic anxiety by multiplying its length past its width and summit. Convert units of measurement equally needed. This will equal your infinite'south volume, with the required airflow equal to this figure in cubic anxiety per infinitesimal, or CFM. Here is what the formula looks like:

ventilation-guide.-artwork-3.jpg

For example, a 48"x36"x72" grow tent converted to feet would be a 4'x3'x6' grow tent. Multiplying the dimensions together would equal 72 ft ⁱⁱⁱ. Since a grow space's volume is also the required CFM to ventilate it every minute, this grow tent's base CFM is 72.

Grow Tent Accessories

The next pace is to increment your base CFM by your accessories' efficiency percentages. Adding components similar ducting and carbon filters will reduce fan performance in your abound space which affects are hard your fan needs to work.

When it comes to ducting, the number and sharpness of its bends factor into the airflow resistance. This is because airflow reduces the further it must travel so the straighter the ducting route the ameliorate. The sharper the bend, the harsher the efficiency reduction; a 30° bend cuts the amount of airflow by 20% while a xc° curve diminishes airflow by 60%! Smoothing out whatever wrinkles can likewise improve fan performance and airflow.

If you are using LED grow lights, you must also account for its oestrus output which further increases your required CFM by up to 50%.

These factors add to your required CFM, which calls for a high performing fan in order to move the calculated airflow. Considering accessories on the market can greatly vary, you can use estimated efficiency percentages depending on the type of component.

(Base CFM ten Component factors) 10 (Grow light heat) = Required CFM

For example, our iv'x3'x6' abound tent has a baseline CFM of 72. We multiply this figure past the efficiency percentage of each component. If we add a carbon filter (60%), ducting (~20%), and a silencer (20%) to our ventilation system, we go 166 CFM. From here, factoring in your grow light's heat output (≤50%) will give us a required CFM of 249. Keep in mind that these percentages are not fixed and may vary. Here is the breakdown of this adding:

ventilation-guide.-artwork4.jpg Multiplying your base CFM (72) by the ducting (xx%), carbon filter (lx%), silencer (twenty%), and grow light heat (l%) of your selection will yield about a required 249 CFM.