VEVOR RT150CTW4 Bedienungsanleitung Seite 16

6.7 Place filter in return air vent grille. It may already be installed on some units.
6.8 Mechanical ADB also requires two temperature control knobs.
CAUTION
Please open the air outlet when the air conditioner is running, and the
air volume can be adjusted by adjusting the angle of the air outlet baffle.
- 15 -