When designing a building, a plan for its ventilation is developed, however, usually such a provided scheme is not enough for effective air exchange. Therefore, it becomes necessary to plan ventilation first. It is best to start with choosing a duct fan , because its use allows you to organize ventilation in the room most effectively .
One of the main defining characteristics of a duct fan is its power. It is selected taking into account how much air is to be processed in the room for a certain unit of time. In other words, this is the fan capacity, which is measured in m³ /h. Power is the main, but not the only characteristic that should be taken into account when choosing a duct fan. It is also worth paying attention to the air exchange rate, which shows the number of complete air changes in the room per hour. This value is determined by SNiP and, for example, is equal to 11000 - 110000m³ /h for office premises.
In modern realities, the problem of saving space in the room is especially acute. Therefore, duct fans should take up little space and fit into air ducts without any problems. Such problems do not bother, for example, a roof fan, because it is not installed inside but outside. The duct fan should not only be compact, but also powerful in order to provide the required air exchange.
You should also pay attention to the speed with which the air will leave the fan. This parameter depends mainly on the power of the duct fan and the diameter of the duct. The recommended speed is 12 to 14 m /s. If the pressure is lower, then the fan will not be efficient enough, and if it is higher, the noise level will increase. As they say, a middle ground is needed here.
Another important factor is the form factor of the case. There are duct fans in round and rectangular casing and are installed in circular and rectangular ducts, respectively. Usually, round fans are made in a plastic case, and rectangular ones - in a metal one. The plastic shell absorbs more noise, and the metal shell is more durable, so the final choice rests on the client's shoulders. He should weigh the pros and cons as carefully as possible, and only then make the most rational decision in this case.
