The fresh air system needs to be turned on 365 days a year. How do we judge when the filter needs to be replaced?

This question is not necessarily true. The traditional fresh air system is just pure ventilation, which introduces outdoor air and exhausts indoor air. This fresh air system without filtering function naturally does not need to replace the filter screen. Emerging fresh air systems all have filtering function, because the pure introduction of outdoor air is also polluted, sometimes very serious, such as PM2.5, automobile exhaust, industrial waste gas and so on. As far as the well-known Huandu fresh air system is concerned, it has a built-in multi-layer filter screen. It is recommended to change the primary filter element three times a year, once in foggy days, once after catkins, once in winter, and once a year for high-efficiency filter elements.

Of course, just not changing at such a speed doesn't mean there is a problem. The filter replacement cycle of fresh air system is different for different brands and products. You can visit JD.COM. Many machines change this filter every three months, and some products have thicker filters and take a long time. For example, the filter screen of Dean's new fan is changed once every six months to one year.

German Bolong fresh air purification system adopts European standard HEPA H 13 pure physical filtration, and the filter element needs to be replaced after 4-6 months in normal environment, but the specific time varies according to the air quality on site. Germany Bolong fresh air purification system comes standard with patented technology of SFM intelligent filter life, which can monitor the clogging degree of filter in real time and remind users to clean and replace it in time.

Intelligent reminder function of filter element, refusing to waste or overuse. The status of the filter screen can be seen at a glance, so as to avoid the secondary pollution odor caused by the long use of the filter screen: the fresh air system will produce odor if it is used for a long time or not used for a long time. This means that the filter screen loses certain purification efficiency and may breed mold. At this time, the filter should be replaced in time. Air output: After the fresh air system is used for a certain period of time, the air output will be weakened, indicating that the filter screen has reached a certain adsorption saturation, so it is necessary to consider replacing the filter screen.