A sprung seal assembly includes a flexible sprung seal having a center section disposed between opposing curved and cantilevered first and second end sections. First and second free edges of the first and second end sections respectively are trapped within a retainer. First and second sliding lugs attached to the first and second free edges respectively are slidably disposed in first and second channels respectively. The first and second free edges are trapped in the retainer by the first and second sliding lugs disposed in the first and second channels between a mounting surface and the retainer attached to the mounting surface. The center section may have a wear strip. The sprung seal assembly may be disposed between a relatively fixed sidewall and a relatively movable flap of a nozzle assembly. The retainer is mounted to the flap and the center section is in sealing engagement with a sealing surface of the sidewall.