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Fläkt Woods - Fire Safety - Pressurisation

Fire Safety Systems - Smoke Control - Pressurisation System - Fire Dampers - Smoke Dampers - Fire Valve

Every day, millions of people work, live and entertain in buildings and need to be protected with air management in case of fire.

You can protect the building and the lives of the occupants using fire safety systems. The object of any fire safety system is to prevent the uncontrolled spread of smoke and to remove smoke to improve conditions for escape or fire brigade access.

Smoke extraction is also used after a fire to remove smoke residue in the air and minimise the effect of smoke damage.

Fire & Smoke Dampers

Self-closing fire and smoke dampers are a well-known way of preventing the spread of smoke and fire via ventilation ducts across separation lines.

Fläkt Woods’ fire and smoke control dampers as shown below are reliable and tested according to EN 1751, EN 1366-2 and EN 13501-3. They are also tested according to the EN standards for their specific use.

CE markings for fire dampers are in compliance with product standard EN 15650:2010 and Construction Product Directive 89/106/EC.

Fläkt Woods’ range of dampers include both fusible link versions and actuator versions for improved response time.

We have found that fusible linked sensitivity becomes reduced the further away from the fire zone the damper is located, whereas an actuator linked to an in-duct smoke sensor will close at the first sign of fire, maintaining the building compartmentation.

Fire Valves

Fläkt Woods’ KSOF fire valve is a fusible link operated extract valve used to prevent the spread of smoke from a room into duct systems.

KSOF is CE marked based on product standard EN 15650:2010 and tested according to test standard EN 1366-2.

JM Aerofoil HT

All fans are CE marked and tested to the latest internationally recognised standard IS0 5801 Part 1 Installation Category D for aerodynamic performance and BS 848 Part 2 (1985) for acoustic performance.

Coupled with the above fan diameters, the adjustable pitch Aerofoil impeller gives the exact performance required with a non-overloading fan characteristic.

Designed for emergency ventilation of hot fire smoke applications:

  • 300°C for one hour or two hours' operation for 400°C
  • EN12101-3 certification for 400°C for two hours
  • Sizes from 315mm to 2500mm
  • All casings are hot dipped galvanised
  • Volume flows up to 150m³/s
  • Static pressure up to 1900 Pa
  • Motor protection IP55
  • Inverter controllable for ambient temperatures

Mechanical Smoke Control

Natural smoke shafts originated from research carried out by BRE in 2002.

However, these systems require a large 1.2m² smoke shaft which can be difficult to fit in tight, urban residential builds. This led to the development of mechanically ventilated shafts to provide both firefighting and means of escape protection.

Unlike natural shafts or pressurisation systems, mechanical smoke shafts do not yet appear in the Building Regulations and are treated as a fire safety engineered approach.

The following regulations are used as guidance for the development of this design, with CFD modelling used to back up the calculations:

  • Approved Document B (ADB) of the Building Regulations is applied to the stairwell ventilators, lobby ventilators, system triggering method and ventilator-free area measurement;
  • European Standard 12101 Parts 6, 7, 9 and 10 are referenced for fans, ducts, control equipment and power supplies;
  • PD 7974-6:2004 - The application of fire safety engineering principles to fire safety design of buildings;
  • Smoke Control to Common Escape Routes in Apartment Buildings, published in 2012, offers a comprehensive guide to smoke shaft applications for residential buildings.

After more than five years of common usage, there is a bank of data available to inform such selection for most buildings, particularly residential developments where one lobby is very like another.

At Fläkt Woods, we have available data from dozens of models and have aggregated this into a matrix to develop suggested extract rates for simple buildings. With this data developed an easy guide to select the extract fans, lobby vents, stair vents, controls sensors and power supplies necessary to have a workable solution.

For more information, please do not hesitate to contact us where our experts will answer any questions.

Click the PDF image to view the technical information in full

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Fläkt Woods Ltd
Axial Way
Colchester
Essex
CO4 5ZD

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Tel : 01206 222 555
Fax : 01206 222 777

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