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Ventilation systems for green houses or grow boxes are important for the necessary airflow.

Purpose of Ventilation Systems:

• Extraction of stale air
• Cooling down air when lamps with high heat loss are used
• Reduction of odor

To achieve one or more of these goals, often a combination of extradtion fans (inline in most cases) and activated carbon filters are used in green houses. Which fan/filter combination is the best choice depends on the size of the room and the desired frequency of air exchange per hour. In addition, a warm attic requires more air flow than a cool basement. You also need to take into account the number of lamps that might rise the temperature as well.

Setup Extraction System:

A basic equipment consists mainly of these parts:

• (centrifugal) fans
• carbon filter
• duct hoses
• fittings, clamps

How to calculate the necessary Fan Capacity

((room volume in m³) + (30% of the room volume since the filter might reduce the performance ) ) * desired air exchange frequency.
If we assume a room size of 20m³ and we want to exchange the air 12 times per hour we get the following result:
(20 + 20/100 * 30) * 12 = 312m³
Thus, we need a fan that has at least the power to achieve the air flow of 312m³ per hour. Yet, this calculation applies only to duct hoses less than 1m long. If they are longer, you need to take the length into account also. So for let's say 3m long hoses you calculate:
( (20 + 20/100 * 30) + 3) * 12 = 348m³
You'll need a fan with a power of approx. 350m³ per hour.

Hose Fitting

To connect your ducting parts you can use either ducting clamps or just duct tape. Yet you need to be careful that they don't get disconnected in case of vibrations. So the heavy parts (the fan itself) really needs to be secured tightly, especially when they are mounted on the ceiling. If you have a high-capacity fan you may want to use insulated ducting to reduce the noise. If that does not suffice, add a silencer as well.

Fitting Sizes of Fans and Filters

The connecting sizes for the parts are standardized. Depending on the fan capacity they usually range from 100mm to 315mm. If you already have a fan or filter and the other part does not fit you can get a reducer.

Air Flow Control

For your environment control (duration of fan operation and power) you can use either simple timers or special fan controllers that can regulate the temperature or air humidity.

Intake Fans

If the grow room only requires fresh air for a higher oxygen amount, simple intake fans should suffice. Just put on into your ducting hose.