How to judge where the arrow in the installation direction of the air filter points?
Air filter products with plastic shells are common in Japanese and Korean models, so attention should be paid to prevention when maintaining these vehicles. At the same time, when installing the air filter with plastic shell, you must read the product technical description and installation guide carefully, and check the after-sales technical data and installation process provided by the vehicle manufacturer if possible.
Generally speaking, the arrow direction of the air-conditioning filter element in an automobile also indicates the front and back of the air-conditioning filter element. The arrow direction represents the air flow direction, that is, the installation direction. When installing, the front side needs to face the airflow direction. You can also judge the advantages and disadvantages by observing the surface layer of air conditioning filter element. Ordinary rough surface is the front, with the top facing the airflow direction, and the surface with support line structure is the back, with the back facing the airflow direction. The black surface containing activated carbon is the front surface, and the white surface facing the airflow direction is the back surface.
How to avoid reverse installation of air filter
After taking out the new air filter, carefully observe the structural difference between the air filter itself and the front and back of the plastic shell, and confirm the installation direction. When you are not sure about the installation direction of the new filter element, don't take out the old air filter in a hurry. You should take a picture before you open it. The photos can be used as a reference for future installation.