View Air Filter Has No Arrow UK. Not sure how to change a filter in your home? Well watch my video that easily explains the process.
That keeps it from scratching the inside of your engine or contaminating your make sure you line up your air filter in the same direction as the old one. If your air filter doesn't have an airflow arrow, then make sure the mesh is facing the blower of your hvac system since this is the last surface the air touches. Removing the air filter will upset the fuel to air ratio, making the engine run lean.
(the arrow on the filter—you'll see it—should be pointing at the fan).
An arrow on the filter's frame shows you the direction that air should flow. Have a question about this project? If you take out the installed filter, the dirty side is on top so that implies that the airflow is down. The filter is installed so that the arrow (and air flow).