Description Product Reviews Optex AP-20NB(C) Indoor Recessed Mount Wired Curtain PIR Detector The AP-20NB(C) recessed mout PIR detector provides a 20ft. (6m) curtain detection area. Compact and discreet design allows the AP-20NB(C) to offer low-profile installation for various indoor application needs. Main Features Ceiling mount: 20′ x 3’3″ detection at 14’9″ height Wall mount: 20′ x 14’9″ detection at 4’11” height Curtain or plane detection 0 Reviews Hide Reviews Product Reviews