Carefree 212000A Buena Vista Plus 20' Room Fits traditional manual and 12V vertical arm awnings. Note: Size listed refers to the center of arm to center of arm measururment of your awning frame. Fits awnings with an awning rail to ground measurments between 86" to 138". Setting up the Buena Vista+ is quick and easy. The door can be mounted on the left or right side, and there's an easy to use wall seal. It takes less than 15 minutes to set up (After initial fitment). Features Include: ground stakes and a skirting panel. Clear weather-view zippered panels on the outside keep rain out, and the zippered panels on the inside are for privacy. Includes a one-piece skirt for under the RV. Support Rafters keeps both a taught canopy and the room fitted against your exsisting awning. The ends of the Buena Vista+ lock up tight against the RV and the awning roller without drilling or permanent mounts. Packs up into a convinient storage bag (included). Notes: Please see Instructions for more details; This room is not completley sealed agains elements including rain, bugs etc.. Does not include a floor.