Where is the central air-conditioning filter installed
In the wind vents below the unit, it is open and open. Some devices have their own net, which is recommended to be removed when the vents are installed.
In the wind tunnel entrance (there is a special installation filter, the two sides have screws to screw down, install the filter net, and then screw the screw). According to requirements: 3 to 5 days to replace.
The inlet of the wind tunnel is also available.I hope my answer will help you.