You supply the exit device and ACSI supplies high quality UL listed modifications to a wide range of manufacturers exit devices. With over 30 years of electric locking experience, ACSI offers proven design, fast factory delivery, and competitive pricing.. ACSI engineers and technicians are available to provide system design, wiring diagrams, and a variety of technical services. ACSI Series 1550 Latch Retraction Exit Device modifications provide a remote means of unlocking exit devices. UL Listed for both Panic and Fire Exit Hardware. SOlenoid assemblies retract the latch bolt for momentary or maintained periods of time. Available in Mortise exits, Rim Exits, Concealed, and Surface Vertical Rod Exit Devices. Standard ACSI series 1550 Systems inludes - 1 ACSI series 1550 Exit Device Modification, 2 ACSI series 1406,1426,1406B, or 1426BB Latch Retraction Power supply, 3 ACSI Series 1100 Electric Hinge. Electrified Vertical Rod Exit Devices are UL Listed to operate properly on doors not exceeding 48 inches wide and 96 inches high.