Roller shades are typically canvas, mesh, or clear plastic lowered from a supported top roller either by crank and gear, or by motor and remote control. The roller can be enclosed (hood or cassette) for storage. There is a weight bar at the bottom to keep it smooth and vertical. Sometimes guide cables are placed at the sides, or tracks, to prevent side or sway action from happening in the wind, or to prevent bumping when mounted next to the house or windows.
Drop Shades differ from Roller Shades in that they are pulled up or let down with a rope and pulleys set-up. The bottom hem contains a weatherproof wooden dowel (about 2 ½” diameter) to stabilize and allow the fabric to roll smoothly to the top. Sometimes small straps are place at the bottom to fasten to railings or decks preventing wind lift or sway.
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