CALL OUR TEAM NOW 0800 433 4281 Lines open today 8am - 6pm
Menu Live Chat Search Contact Us Basket (0)

Order Before 4:30pm

For next working day delivery

Live Chat - Online

Instant help & advice

0% Credit Available

Apply for an account

Trade Discounts

& exclusive pricing
image all three union assa abloy door sense fire door hold open devices, available in white, red and black
image all three union assa abloy door sense fire door hold open devices, available in white, red and black image of all that you receive in the box, there is a black fire door retainer, two different black floor plates to protect carpet or when there is hard flooring, 2 size C batteries, paper instructions and fixing screws a front image of the square black fire door retainer with the words union assa abloy written on the front. The foot plunger at the top that is pushed down in order to hold open a fire door the back of a black plastic box, at the top is a plunger that you can use to put your foot on to hold open a fire door, at the bottom is the ferrule that pushes into the floor to hold the door open a black plastic box with the words union assa abloy on the front, at the top is a plunger that you can use to put your foot on to hold open a fire door close up of the foot plunger to engage the fire door retainer to keep the door open allowing free movement between rooms a close up of the grey ferule with grip bumps to hold the fire door open, ideal for carpeted floors a side shot of the black fire door retainer showing its low profile and the foot plunger at the top to engage and disengage the ferrule a close up of the top left corner of the union door closer showing the hole to use screws to fix to the door a close up image of the foot plunger showing the grey grips to stop our foot slipping when pushing down the plunger image of all that you receive in the box, there is a red fire door retainer, two different black floor plates to protect carpet or when there is hard flooring, 2 size C batteries, paper instructions and fixing screws a front image of the square red fire door retainer with the words union assa abloy written on the front. The foot plunger at the top that is pushed down in order to hold open a fire door the back of a red plastic box, at the top is a plunger that you can use to put your foot on to hold open a fire door, at the bottom is the ferrule that pushes into the floor to hold the door open a red plastic box with the words union assa abloy on the front, at the top is a plunger that you can use to put your foot on to hold open a fire door close up of the foot plunger to engage the fire door retainer to keep the door open allowing free movement between rooms a close up of the grey ferule with grip bumps to hold the fire door open, ideal for carpeted floors a side shot of the red fire door retainer showing its low profile and the foot plunger at the top to engage and disengage the ferrule a close up of the top left corner of the union door closer showing the hole to use screws to fix to the door a close up image of the foot plunger showing the grey grips to stop our foot slipping when pushing down the plunger image of all that you receive in the box, there is a white fire door retainer, two different black floor plates to protect carpet or when there is hard flooring, 2 size C batteries, paper instructions and fixing screws a front image of the square white fire door retainer with the words union assa abloy written on the front. The foot plunger at the top that is pushed down in order to hold open a fire door the back of a white plastic box, at the top is a plunger that you can use to put your foot on to hold open a fire door, at the bottom is the ferrule that pushes into the floor to hold the door open a white plastic box with the words union assa abloy on the front, at the top is a plunger that you can use to put your foot on to hold open a fire door close up of the foot plunger to engage the fire door retainer to keep the door open allowing free movement between rooms a close up of the grey ferule with grip bumps to hold the fire door open, ideal for carpeted floors a side shot of the red fire door retainer showing its low profile and the foot plunger at the top to engage and disengage the ferrule a close up of the top left corner of the union door closer showing the hole to use screws to fix to the door a close up image of the foot plunger showing the grey grips to stop our foot slipping when pushing down the plunger

Union DoorSense Acoustic Release Hold Open Fire Door Retainer – J-8755A

DoorSense, by Union, 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
Customer Reviews

From: £99.60 inc VAT

£83.00 ex VAT

Customer Reviews

Customer Reviews (0)

Rating Not Available

Reviews by Real Customers

To make sure that all our reviews are real and accuarte, we only allow customers that have purchsed this product from us to write reviews.

No Reviews Available

No reviews have been written for this product yet.

If you have purchased this product from us and would like to write a review about it please complete the product review from. Please Note: to ensure the accuracy of our reviews you will need to provide a valid order number to leave a review.

Review this product now
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
image of a silver door closer with a rectangular cover and closing arm above

Rutland TS3204 Overhead Door Closer - EN 3-4

From: £29.88 inc VAT

£24.90 ex VAT

 image of a silver door closer with a rounded rectangular cover and closing arm above

Rutland TS5204BC Overhead Door Closer - EN 2-4

From: £40.18 inc VAT

£33.48 ex VAT