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Ravenscroft specialises in providing innovative and energy efficient engineering solutions for the heating and ventilating sector. Our customised engineering solutions yield high quality indoor air while reducing HVAC operating costs.  

fire damper ravenscroft bsd-blf

Ravenscroft fire dampers function as an electrical reset smoke damper when fitted with Belimo BLF-T motor.

Why Choose a Ravenscroft Smoke Damper

  • Fast installation
  • Fire rated up to 2 hours
  • No access hatch required
  • Fitted with Belimo BLFD-T spring-return motor
  • Supplied as a kitset
  • Also available as plasterboard wall or concrete/masonry only version
  • Stainless steel version also available

The motorised fire dampers have the same benefits as the regular Ravenscroft BSD-C and BSD-PW fire dampers. They are fire rated up to two hours. The installation is quick and no special framing is required, nor is an inspection hatch needed to check damper operation.

The Ravenscroft smoke dampers come fitted with Belimo BLF-T Spring-return motor, combined with thermo-electric tripping device (cannot be fitted on site).

  • Motor torque: 6/4 Nm
  • Motor control: open/close
  • Available motor voltage options: AC/DC 24V, AC 230V
  • Running time: Motor 40 ... 75 s (0 ... 6 Nm) / Spring return open or close 20 s

Download the brochure on the Ravenscroft Smoke Damper

Installation

Co-ordination between trades on site and at time of tender is greatly reduced as the damper does not require additional hole reinforcement or framing. Actual installation time is minimised.

Flexible ductwork connectors must be used to separate rigid ducting from the damper. These prevent excess force being transferred to the plasterboard in the advent of ductwork deformation or collapse during a fire or earthquake.

Approval

Tested to AS1530.4-1990. FRR 120 minutes in plasterboard walls. BRANZ Test Report FP 2376.

For masonry walls the standard Ravenscroft fire damper, BSD-C, without the insulated sleeve is available satisfying AS1530.4-1990 for at least 120 minutes under BRANZ Opinion 97/1026.

The Ravenscroft fire damper for plasterboard walls, BSD-PW, meets the requirements of AS1682-1991 Parts 1 & 2. (Means of Code Compliance: Verification by Laboratory Test)

Dimensions

fire-damper-bsd-m-c_graph

BSD-C/M D Hole B C F
125 124 135 95 245 225
150 149 160 95 245 250
175*) 174 185 95 245  
200 199 210 95 245 300
250 249 260 95 245 350
300 299 310 155 245 410
400 399 410 155 245 650

 *) Special order only at the moment (extended lead time)

fire-damper-bsd-m-pw_graph

BSD-PW/M D Hole B C F
125 124 165 95 245 225
150 149 190 95 245 250
175*) 174 215 95 245  
200 199 240 95 245 300
250 249 290 95 245 350
300 299 340 155 245 410
400 399 440 155 245 650

*) Special order only at the moment (extended lead time)