acoustical rating automatic walls 10650 folding doors operable doors wall systems Acoustical Rating Way Protection Auto-Lift Wall Systems carry three different guarantees for your protection: Parts & Labor Parts Only Acoustical Rating Preformace is an acoustical Rating wall that is hard, rigid and flat in its down position. When not in use, however, it folds vertically for storage in the ceiling. Developed as a modular system, it consists of a grid of rectangular acoustical panels.