Carefree TT1490042W SideOut Kover II  White  146" - 149" Slideout Awning Flange size range: 151"-154"; Roof size range: 146"-149"; Fabric width: 153" Accommodates extensions up to 42" Includes full length aluminum wind deflector to prevent billowing during travel Extends and retracts automatically with the slide room Helps keep leaves, dirt & debris off slideout and our of RV