The resistance difference of each high efficiency filter will affect the air flow balance and airflow uniformity. When installing, individual air filters with high or low resistance should be removed. Air filters with similar resistance should be arranged in the same room, and air filters with different resistance in the same room should be evenly distributed.

For the air filter on the same air supply surface of one-way flow clean room, the requirement of resistance difference is more important. According to the code for construction and acceptance of clean room, the following relationship should be met:

Actual resistance value of each set (under rated air volume) = (0.95 ~ 1.05) × average actual resistance value of each set on the air supply surface.

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