Inside Mount shades get mounted or positioned inside the window frame or casement. In order to do this, there must be the required mounting depth inside the window for the shade to lay flush with the window's opening(depth required varies by Custom Control selection). Inside mount shades are great for a seamless, modern look. Since the shade sits inside the window, if total blackout is required, inside mount shades may not be the best way to go. Outside mount shades get mounted outside the window on the window frame itself, the drywall above the window or the door frame above the glass. Outside mount shades are recommended for rooms where blackout is of utmost importance. Outside mount shades are also recommended for windows without sufficient mounting depth and for all door mounted shades.