Control Box, Pneumatic, Auxiliary 'Blow-Open', Electric Strike (ES) Relay (Requires LCN 900 series compressor)
Auxiliary 'blow-open' control box works with or without 7901ES/7902ES Series Control Box and one or two pnuematic Auto Equalizers. Controlled by the smoke evacuation system, the 7949 Series Control Box will unlock and open the door(s) to allow fresh air into building