There are 5 different categories that Fantech places its wall fans. These categories are:
Shutters are very important for wall fans because they help to regulate the ventilation from the fan. They also prevent a backdraft from occurring when the wall fan is not on. An important benefit of using these fans is that they close once they remove the stagnant air. This helps to keep the clean air inside the building. It also helps to reduce the amount of hot or cold air seeping through the fan.