Vents VS Exhaust/Shutter System
There are many factors to consider when greenhouse shopping; Insulation, glazing material, space, foundation, heat and of course greenhouse ventilation. And if you are planning on growing year round you want to make sure to choose the most energy efficient structure because heating in the cooler months can be expensive – This is where great insulation can reduce energy costs.
Manual or automatic roof vents have their advantages and disadvantages. If the greenhouse is designed very well then aerodynamics have been considered and the roof vents will be placed in the perfect position for wind to pull air out while still circulating air through the greenhouse. Placement of the greenhouse is also very important for wind to catch on the ridge of the greenhouse and create a vacuum type air movement. A large circulation fan or multiple fans will be required in the interior of the greenhouse and will aid in fresh air exchange. Some larger or commercial greenhouses offer a roll up design that allows for the sides of the greenhouse to be completely open to the outside. Now, if you are concerned about pests this might not be the best option for you because generally with open air vents many of them are needed and screening them can be difficult, if not impossible. Maintenance can give you trouble as well. If you do not have the time to go open the manual vents, do not have the ability to climb a ladder for high roof vents, or have limited budget for automatic vents then an alternative option should be considered. For a very small/beginner greenhouse or a small lean-to style with a low insulation value these type of vents are appropriate. The higher the insulation value of the greenhouse glazing material the stronger ventilation you will need.
Thermostatically controlled ventilation is very popular and with supplemental air circulation can be most efficient. Sunglo uses exhausts fans and motorized intake shutters controlled by a thermostat with the option to hook up to a heater as well; we call them power panels and include other electrical items too. So if you prefer your greenhouse to remain between 50° and 75° all you have to do is set the thermostats for the ventilation and heater to turn on and off automatically. The exhaust fan and shutter are synchronized to open at the same time. The motorized shutter opens to allow fresh cool air into the greenhouse while the exhaust fan starts to spin and expel the used hot air that has risen inside the greenhouse. Sunglo’s basic system is rated to exchange fresh air throughout the greenhouse once per minute; providing you with a system that cools rapidly. The basic system is included with every Sunglo greenhouse. The exhaust fan(s) are placed as high as possible on one end of the greenhouse and the
shutter(s) are placed as low as possible on the opposite end. This allows for the best possible circulation throughout the entire greenhouse. There are many brands to choose from but either aluminum, steel, poly or fiberglass options are available each with different pros, cons, sizes and pricing. We include poly exhaust fans and shutters with our greenhouses but any type is available for upgrade. Automatic vent openers are available for the gable end manual vents on our greenhouses and will increase air circulation as well. They do not use any electricity. These automatic openers are controlled by a wax piston. By twisting the piston left or right sets the degree to which it opens. These automatic openers are specially important in areas where the climate stays consistently at or over 80 degrees. By setting up a circulation fan inside the greenhouse and setting the automatic openers to open before the ventilation system starts will save you electricity usage. Sunglo also offers a variety of atmospheric controls. If you would like to view some of the ventilation products Sunglo offers please visit the Schaefer website or give us a call with your inquiry.
Learn more about summer climate control here.
If you are interested in adding ventilation to your greenhouse or would like to discuss options or have questions about anything please give us a call at 425-251-8005 or e-mail to firstname.lastname@example.org.