Under the condition of rated airflow using, 3-4 months need to change the filter;

Or when the resistance of the filter to reach more than 400 pa, filter must be replaced;

Such as filter is used to clean type filter material, the replacement of the filter material, can use a solution of water or with neutral detergent to wash, dry, and then put on; Most allow secondary cleaning, which must be replaced a new filter;

Such as using the dust concentration in the environment, then this will also reduce the service life cycle.