Central air conditioner air filters explaination
Filter resistance: the filter resistance is one of the main components of the total resistance of the air conditioning system, which increases with the increase of the air flow through the filter. When evaluating the filter resistance, it refers to that under the rated air volume, in addition, when the filter sticks dust, its resistance increases due to the increase of dust amount. Therefore, the resistance before dusting is generally defined as the initial resistance, and the resistance to be replaced is defined as the final resistance;
Dust holding capacity of the filter: when the resistance of the filter reaches the final resistance under the rated air volume, the mass of dust particles contained by the filter is called the dust holding capacity of the filter;
Area velocity and filtering velocity of filter: Area velocity refers to the velocity of airflow passing through the windward area, which is also the wind velocity we often measure. The filtering speed refers to the air flow speed on the filter material area. Its speed can express the main performance index of the filter.
The classification and efficiency testing of air filters are generally divided into coarse efficiency (also called primary efficiency), medium efficiency, sub efficiency and high efficiency according to the level of filtering efficiency.
