Pressure relief unit fitted with an automatic multiblade control damper for vertical flow (roof mounting). The roof base is supplied with internal insulation, an inspection cover and all-round adhesive seal edge.

The multiblade damper is made of insulating material finished with an additional coating to protect against moisture. The spring return actuator is factory fitted - normally open.

See technical details for more information.

Optional accessories

• Ventilation function: consists of a Type RK2 control damper factory fitted with a spring return actuator Type SFR (normally closed (CLOSED)) and a surface-mounted key switch
• Smoke exhaust function, consisting of: Actuator with spring return Type SFL for control damper Type RK2, normally open (OPEN)
• Available with split design giving control of two pressure relief areas for two volume flows
• Weather compensation: Adaptation of response dependent upon outdoor temperature by means of a Type SLM-SLC modulated actuator. Response time remains fast (< 3 seconds) and automatic without auxiliary power.