Ventilation system & Setup

Like a good garden design, an equally good ventilation system can be broken down into a few easy steps. The purpose of ventilation is to: Perform the work as quickly as possible. It operates with as few turns as possible to avoid damage and noise. The basic idea is to:

• Perform the work as quickly as possible
• To operate with the least possible speed to avoid damage and noise
• Pull in fresh cool air from the bottom of the crop
• Ventilates hot used air from the top.

Ventilation Function

Easy enough...determine where you will exhaust your hot air and than design your garden so the garden grow light is nearby. If the distance is greater than 20 feet, make sure the fan in your exhaust fan setup can handle the extra strain. Try to make the run straight from your lights to the exhaust point.

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Since hot air rises, you will be removing much more heat from the garden by starting your exhaust near the ceiling of your garden area. This creates a vacuum that naturally pulls cooler, fresh air into the garden area.

Use an oscillating fan on the floor to keep the cooler, fresh air moving through the plants and toward the exhaust.
Fans are much more efficient at PULLING air than at PUSHING air. With this in mind, the exhaust fan is usually placed right at the point of exhaust. From there it will pull air through your exhaust fan setup (through the light reflector) and out of the garden area.

Some examples

If your space is very limited, you may need to place the ventilation fan outside the crop area. Keeping a part of the installation outside the garden area will help you keep the temperature low where you want it.

This is an ideal ventilation system. The part of the plant located in the garden has been placed high to trap the warmer air. The ventilation system is straight (no turns) and short in length. If you can not fit the carbon filter on the ceiling, try to place it as high as you can in the room.

One side note...the examples here are all shown with centrifugal fans. With no carbon filter, these examples would work fine with squirrel cage fans.