Extraction / Intraction: a story of volume and heat

An essential parameter for indoor growing, good ventilation will make all the difference and prevent your garden from turning into a real furnace. Extraction will allow you to evacuate the warm and low CO2 air to be able to introduce fresh air from outside. It is nevertheless important to know how to calculate the extraction volume of your growing room so that your ventilation is optimal.

How to calculate the extraction volume?

In the case of a growth phase, with low heat emission lamps, you can calculate the volume of your space by applying the following formula (per meter) :

Length x Width x Height = Volume of space.

For example, for a BBS box 90x60x180cm: 0,90x0
,60x1,80= 0.972m3

That we multiply by 60, which corresponds to the volume of air that must be expelled per hour.

So 60 x 0.972 = 58.32m3/h.

But the extraction will depend essentially on the space in which your tent is placed, the outside temperature but also and above all on the type of lighting chosen.

How to choose your extractor?

As we have seen above, the power of the extraction/intraction, will largely depend on the bulb. Therefore, here is a table advising you the necessary intraction and extraction according to your HPS/MH lamp. These indications are only valid for a single lamp.

Once you find the power you need. All you have to do is pitch your tent.

- Provide an extractor to evacuate the air from your tent (preferably towards the ceiling)

- An air intake on the ground (intraction) to boost air circulation.

- Fans to homogenize the air in the tent.

Now that you have the basics, all you have to do is get started! To find all this information and much more, we recommend the beginner's guide to hydroponics or the very comprehensive Hydroponics for everyone that will make you the master of hydroponics!