Dealing with air pollution is a common problem,  more  more manufacturers have begun to install air purification devices in the car. However, for old cars, it is  only cumbersome to install the air purification in the car alone, but the effect should also be hit. question mark? In fact, the most direct way to deal with air pollution in the car is to start with the vehicle's own air conditioning system. Installing a dedicated PM2.5 air conditioning filter is the most effective  easiest method. Many third-party manufacturers in the market have launched special The finished product of the air conditioner filter element can be replaced directly, but we turned around. The price of similar products is mostly several times more expensive than the ordinary filter element. Is there a lower cost solution?

In fact, the core of the PM 2.5 filter element is to add a HEPA filter paper layer for PM2.5 on the ordinary filter element, so as to achieve the filtering effect of PM2.5,  there are many such filter paper products on the market that can be DIY added, so this time I have found a common filter element  a special HEPA filter paper. Let's take a look at the effect of DIY low-cost PM2.5 protective filter element.

Selection of HEPA filter paper

In this test, after purchasing the original standard air-conditioning filter elements of Man brand  Mahle, we also chose two HEPA filter papers with better sales of Ma Yunjia,  installed them on the standard filter elements for testing.