Mobile Home Window 14X21 Insulated Vinyl Thermopane Lower Tilt Sash Screen Included 14X21 Vinyl Mobile Home Window-Mobile Home Replacement Window 3/4" Insulated Thermopane glass. Lower tilt sash. Screen Included. Built in nail/screw flange for easy installation Built in J-Channel to receive vinyl siding or trim for a nice clean look Made in the USA!