EFD (Blade)

2hr Rated Square Fire Damper

  • Manually or Electrically Operated
  • 72°C Fusible Link Failsafe
  • Minimum Size 100mm x 100mm
  • Maximum Size 1200mm x 1200mm
  • Depth vary from 350mm to 600mm
  • Standard Depth is 125mm
  • Blades In or Out of Airstream
  • Horizontal or Vertical Installation
  • NOT available in Stainless Steel

Technical Specifications


Electrovent EFD Fire Dampers are fire
protection products used in HVAC installations to prevent the spread of fire inside ductwork through fire-resistance rated walls and floors. EFD Fire Dampers are SANS 193:2013 certified and 2-hour fire rated.


The EFD frame and blades are manufactured from galvanised steel as standard. Blades are installed in the casing with low friction brass bushes and linkages provide parallel blade operation.

Every EFD is fitted with a fusible link designed to close the fire damper when duct temperature exceeds 72˚C. Blade position is indicated from outside of the casing, and each fire damper is fitted with an inspection panel for easy fusible link replacement.


The EFD can be supplied with:

• Locking quadrant for manual operation

• Extended shaft for actuators by others

• Electrical actuator motorising control

The fail-safe spring return actuator is standard, though various other actuators options are available.

Where external space is a constraint, the actuator can be mounted internally within the airstream.

Fusible links are fitted to all fire dampers (manual and motorised) to ensure fail safe operation as links operate independently of the actuator in emergency high duct temperature conditions.

The EFD is suitable for vertical and horizontal installation in walls and slabs.

The EFD has been tested and is certified in both orientations (test reports available on request).

Spigots can be fitted for spiral duct installation.

EFD is also available in 304 and 316 stainless steel.


Minimum size 100mm (w) x 100mm (h)

Maximum size in single section
1200mm (w) x 1200mm (h)

Sizes exceeding maximum are combined in sections.

Casing depth is 350mm as standard with options of 400mm, 450mm, 500mm and 600mm available.

Flange size is 30mm as standard or to client specification.

Leading Manufacturer of Airtight Doors, Fire, Smoke, Control and Non Return Dampers

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