The air volume of central fresh air system usually ranges from 150m³/h to 1500m³/h. Specifically, the air volume of fresh air system can be calculated based on the amount of fresh air required for the room to accommodate people or the number of room ventilations. For example, when calculating by the number of people accommodated in the room, the fresh air volume Qm can be calculated by the formula Qm=N × qm, where N is the number of people in the room and qm is the amount of fresh air required per person. When calculated by the number of room ventilations, the fresh air volume Qm can be calculated by the formula Qm=N × V, where N is the number of room ventilations and V is the room volume.
The air volume of central fresh air system of different brands and models is also different. For example, the air volume of Hisense central air conditioning fresh air system can reach 990m³/h, while the fresh air volume of fresh air air conditioners is relatively low, up to 60m³/h, and the fresh air volume of most fresh air air conditioners is 40m³/h or less.
In addition to providing fresh air, the central fresh air system also has the functions of deodorization, dust removal, dehumidification and room temperature regulation. It works through a displacement transmission method. Outdoor fresh air is automatically sucked into the room through negative pressure, while taking away indoor exhaust gas and exhausting it to the outside in a centralized manner, forming a good circulation system. In addition, the exhaust gas will be heat recovered, with a recovery rate of more than 80%, further saving energy.