[. . . ] MODE Set Switch TEMPERATURE 5 4 3 2 1 MIN COOL 6 7 8 9 10 MAX COOL Fig. [. . . ] This unit is designed for installation in standard double hung windows with actual opening widths of 559mm to 915mm . The upper and lower sash must open sufficiently to allow a clear vertical opening of 355mm from the bottom of the sash to the window stool. If storm window presents interference, fasten a 50mm wide wood strip(not included) (OUTER SILL) to the inner window sill across the full width of the sill. The air filter behind the front grille should be checked and cleaned at least once every 2 weeks or more often if necessary. Open the inlet grille downward by pulling out the top of the inlet grille. Remove the air filter from the front grille assembly by pulling the air filter up slightly. [. . . ] Rinse and gently shake the water from the filter and let it dry before replacing it. [. . . ]