Replacement for RV Door Window 12' x 21', Thin Shade Ready for RV Door Window Blinds, Protect RV Camper Interior Privacy Block The Sun & Heat Radiat If you get a new RV and it already has the frame installed for this, well this is a must have! This rv blinds can protect your privacy, block the sun and heat radiating. PS: Please check the RV window size before purchase.Our rv door window shade is made of premium quality fabric material, stop the sun's rays from penetrating the interior of your RV. The upgraded hard plastic will not deform even after being exposed to the sun for a long time.You need to make sure the distance from the knot to the end of the rope on both sides is between 10-10.5 inches. Make sure the ropes on both sides are the same length and tight so that the rv blinds can move up and down smoothly and holds in place wherever you place it.No need to remove the existing window frame. Unlatch the upper levers at the top of the window frame by sliding from left to right and unlatch the bottom levers on the bottom of the window frame by sliding from right to left. Then hold the rails of the shade at a 45-degree angle, insert the rail end in the corner between the glass and the inner frame. Press upwards and down on both ends of the rail. Securely latch the rail in place by sliding the top levers from right to left and sliding the bottom levers from left to right.This thin shade perfectly and does job well, you can also install it upside down so you can have some privacy while still letting in some light.