Thor Duct®

Smoke Extract Ductwork

Smoke is recognised as the leading cause of death and serious injury during fire outbreaks. It can spread quickly to areas remote from the scene of the original blaze, threatening life, restricting escape, delaying fire fighting and damaging property.


Stairwells and elevator shafts frequently become smoke logged, blocking evacuation routes and preventing firefighters and other rescue teams from doing their critical jobs.


Thor Duct® Smoke Extract ductwork is a key component of a fire strategy, by routing smoke safely out of a building in a controlled manner.

Looking to Specify?

All Thor Duct® products are correctly tested and compliant across all European codes. If you would like an inhouse CPD, please contact us.

CPD Request ➝

Insulation is a critical element

Exhausting smoke across fire compartments creates a potential flashover risk. Flashover, sometimes referred to as rapid fire progress, occurs when the heat and energy being produced by the fire can no longer be absorbed by the materials in the room, and when the temperature reaches its ignition temperature fire breaks out all at once over all the surfaces. Exhausting hot gases creates a potential flashover risk as the heat and energy is removed through the building. As part of the EN tests, insulation will help prevent flashover, and is tested with the ductwork. Section 6.3 of EN1366-8:2004 states “The test shall be made on a test specimen representative of the complete duct assembly, including integral or intended insulation on which information is required”.


Where thermocouples in a type A or B fire test exceeds 140°C average or 180°C single point, the maximum performance of the insulation has been reached. This is stated in minutes and classified(I), 30, 60, 90, 120, 240.


The inclusion of insulation during fire testing means that the system becomes the product. Use of untested combinations of duct and insulation is not permitted without completing a full test program.

Compliance with

EN Code


Thor Duct® Smoke Extract ductwork is comprehensively tested to comply with CEN standard, hEN12101-7 which has been in place throughout the EU since July 2013.


✓ EN1366-9 - Single-

    compartment

✓ EN1366-8 - Multi-

    compartment

Fully Tested



Thor Duct® Smoke Extract is tested in a flexible wall and is suitable for:


✓ Stud partition

✓ Block wall

✓ Concrete floors



Installation



All Thor Duct® Smoke Extract systems are installed under third party certification (Firas) as per DW144.




Product Sizes



✓ Square standard maximum

    size multi-compartment

    smoke 1250x1000mm

✓ Square standard maximum

    size single compartment

    smoke 1900x1700mm

✓ Fire resisting ducts (non

    smoke applications)

    maximum size 2500x

    1250mm

✓ Round up to 1000 Ø

Manufacturing Standards

  • Thor Duct® is manufactured from Galvanised Steel, and uses flanges and stiffeners, without paints or coatings.
  • Thor Duct® is insulated using a calcium magnesium silicate blanket.

Both the product and the insulation have been tested as a system in accordance with test standards which includes access doors, silencers and bracketry.


All tests were conducted in EOTA approved laboratories, and each licensed manufacturing location has a factory production control (FPC) in place to ensure exacting standards of manufacture.

Installation Standards

You can be 100% sure that your installation has been properly managed and is fit for purpose when called upon in the event of a fire.


  • Penetration seal detail is provided for floors and walls. Thor Duct® is suitable for installation in flexible walls (Plasterboard) and aerated concrete floors, having been tested in both.
  • Our installers in Ireland and the UK comply with local guidance and are all members of third party certification schemes.
  • In mainland Europe, installers comply with certification schemes where available.

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