Picking Your Ventilation

There are two main types of ventilation: auto and manual. Your decision will depend on both the size of your operation and budget.

Exhaust Fans

To keep a sealed greenhouse at a desired temperature, the exhaust fans equipped should be of appropriate cfm (cubic feet per minute). This allows the greenhouse to exchange its entire volume of air every minute, thus reducing harmful temperature and humidity spikes. Exhaust fans operate on a thermostat, keeping your greenhouse in optimum growing conditions. This method of temperature control is the most controlled way to cool a greenhouse. It also protects from high winds, dusts, pests, and pollen.

For exhaust fan and shutter light traps, visit this page.

Circulatory Fans

Having circulatory fans in a greenhouse is very important for multiple reasons. Constant air flow increases air health and resistance to disease, it also assist in the hardening of off plants. Furthermore plants need the ability to transpirate, enabling the plant to cool itself and transfer water and minerals to its leaves for photosynthesis. Dotted pores under the plants leaves, called stomata are on the receiving end of this process. Transpiration occurs through stomatal apertures, or the opening of the stomata allowing diffusion of carbon dioxide gas, enabling the process of photosynthesis. Without proper air flow the rate of transpiration is significantly reduced, in turn reducing plant growth.

Maintaining ideal humidity levels is another crucial reason for proper circulation. Without air flow, two types of microclimates form inside of a greenhouse; heat will rise to the top of the house, creating undesirable humidity and condensation. Mixing the upper and lower climates creates even air distribution (do we mean humidity, temperatures, etc?) . HAF fans are a great way to remedy this problem, they are easy to install and run using little power.

When it comes time to install ciculatory fans inside your greenhouse, the volume in cubic feet and style (make link) of the greenhouse are the main influencing variables. Please give us a call to find out what ventilation system will work best for your needs. (541) 480-9392

Picking Your Shutters

Shutters play a crucial role in environmental control and the sizing of them is the most important factor; especially when using an exhaust fan to control the environment. When shutters are improperly sized, the exhaust fans become inefficient preventing the proper evacuation of air. Shutters come in standard aluminum or, for more lightweight applications, in poly. When using an exhaust fan, power shutters are a necessary component for environmental control as they rely on being opened thermostatically when the exhaust fan turns on or off. In other words, the shutters MUST be open when the fan is on and MUST be closed when the fan is off for the system to perform as intended.

An important rule of thumb when pairing your shutters with your exhaust fan is the square footage to the cfm of the exhaust fan. Generally, for every 600 cfm of exhaust, 1 square foot of shutter opening is required. For example an exhaust fan with 30,000cfm will need 50 square feet of shutter opening to allow it to run properly.

Roll Up Sides

Roll up sides are a cost effective and efficient way to utilize passive ventilation in a greenhouse. All of the handles manufactured in our facility can be made for any desired sidewall height. For an automated approach, roll up sides can also be connected to a climbing rod operated by a thermostat. When using roll up sides, it is important to remember that the greenhouse will be exposed to all outside elements including pests, dust, high winds, pollen etc. We recommend installing an insect screen to create a breathable barrier. All of our roll up kits include a sidewall retention system.


Call us at (541) 480-9392 or fill out an inquiry form here to get a custom quote for your greenhouse.