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image all three union assa abloy door sense fire door hold open devices, available in white, red and black

DoorSense Acoustic Release Hold Open Unit

DoorSense is a battery powered fire door retainer, which is simple to install on new fire doors and retrospectively on existing doors. Once installed, these units improve ventilation and accessibility in high traffic areas, while still ensuring that fire doors close in the event of a fire.

  • No wires – runs on 2 x C-Type batteries (included)
  • Acoustic detection system – triggered at 64dB for 15 seconds or more
  • Ideal for schools, hospitals, offices, and public buildings
  • Improves ventilation and accessibility for all
  • Easy to install and low maintenance
  • Suitable for doors up to 1600mm and 160kg in weight
  • Automatic door release via timer function
  • Low battery indicator and fail safe mode
  • CE Marked to BS EN 1155:1997 and EMC tested and fire rated for timber doors (FD120)
  • 2-year guarantee
  • Available in black, red, and white
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From: £99.60 inc VAT

£83.00 ex VAT

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Technical Data

Technical Data

Product Code AADSBK
Brand ASSA ABLOY
Battery Type Alkaline
Warranty 2 Years
Maximum Door Width 1600mm
Maximum Door Weight 160kg
Dimensions (Unit)
  • Height: 207mm
  • Width: 194mm
  • Depth: 43mm
Weight 600g