Shaft Louvre Damper (SLD)

Product features and details.
Shaft Louvre Damper Description

Shaft Louvre Damper (SLD), are multi-zone smoke control dampers and designed for use in natural and mechanical smoke ventilation systems. They are typically installed into shafts to provide extract ventilation to corridors and into smoke control ducts in residential and commercial buildings. 

They are certified to BS EN 12101-8:2011 and have a fire resistance class of EIS 120. They may be used in multi-compartmented smoke control ducts and have an integrity and insulation of 120 minutes. In addition they have been tested for reliability up to 10,000 cycles and may be used for environmental ventilation. 

They are manufactured with a steel casing, and fire rated multi-blade louvres and operate by a drive open/drive close 24V AC/DC Belimo actuator. They are supplied with a hinged white linear grill internally which provides a neat finish whilst enabling quick access for commissioning and service. 

Specific Features
  • Certified to BS EN 12101-8:2011
  • Classified to EN 13501-4:2016
  • Tested to EN 1366-2 and EN 1366-10
  • Fire resistance class EIS 120
  • Suitable for smoke control in multi-zone smoke ventilation systems
  • May be used for environmental ventilation
  • Available up to 1.20m2 @ 500Pa max. geometric area
  • Available up to 0.78m2 @ 1000Pa max. geometric area
  • Manufactured with steel fire protected housing for installation directly into smoke shaft apertures
  • Hinged white linear grill internally provides a neat finish whilst enabling quick access for commissioning and service
  • Remote signalling of both open and closed positions
  • Impact tested as a complete unit with grille to TN75 and TN76 (with reference to BS 8200)
Maximum size Width X Height (mm)

969 x 2041

Response time/closure time


Operational reliability


Fire resistance – integrity


Fire resistance – insulation


Smoke Leakage

500Pa–1000Pa (dependent on size)


AA (Automatic Activation)

Multi Compartment


Mounting Position

VEW, this means the product is suitable for vertical installation into a wall.

Testing Position

i ‹–› o, this means that the product meets the testing requirements from both the inside and the outside.

Size Guide
Stock sizes:
ModelOverall Width (mm)Overall Height (mm)
SLD 75.1108191291
SLD 75.1858192041
For all information regarding this product please download its datasheet.

Installation instructions

Form Aperture
Mount Damper
Complete Connections
Get the installation guide.
Applicable to all mechanical projects
Explore our projects featuring smoke control dampers
Related Products
Shaft Louvre Damper - Residential (SLD-R)
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