Ventilation can be the difference between good and bad grow, so make sure that you have the right system to keep your plants healthy and growing. Greenhouse ventilation is an essential part of your greenhouse. A proper venting system can save you money, protect against mold and mildew, increase crop yields and extend product shelf life. Choosing the right greenhouse ventilation system is important for both safety and growth of your plants. Greenhouse ventilation systems can include fans, air filters or even a combination of several different kinds of systems depending on the size and climatic conditions of your greenhouse.