Why air filter should match the choose and buy?

General myth is that according to the required air quality choose corresponding processing precision of the single filter can meet the requirements, and save money. Actually otherwise, although the required air quality by the selected single filter processing precision of the decision, but didn‘t lead the pretreatment of the low level of filter protection, high precision filter will soon be blocked by heavy load, speed up the filter replacement frequency, which does increase the cost of production.