2006 Toyota Matrix Owners Manual - Page 160

'06 MATRIX_U (L/O 0508) Air conditioning filter (on some models)- You can change air flow direction by turning the instrument panel vents. The air conditioning filter information label is placed inside of the glove box as shown and indicates that a filter has been installed. The air conditioning filter prevents dust from entering the vehicle through the air conditioning vent. The air conditioning filter is behind the glove box. 160