Extended Corridor System

The Extended Corridor System (corridor ventilation system) is designed for means-of-escape corridors in residential buildings. This system offers developers substantial space and cost saving benefits, while providing a safe evacuation route.

Product information

Rapid response and enhanced performance

The Extended Corridor System aids fire-fighters by allowing the corridor to be cleared of smoke rapidly, even during the later stages of a fire, when a conventional system might well be overwhelmed.

It allows safe escape conditions to be maintained in the corridor, even when the travel distance is extended by a factor of 2 or 3 in one direction. This can remove the need for an additional staircase, freeing up typically as much as 38m² of additional saleable or lettable space per floor.

The Extended Corridor System out-performs the conventional solution for both evacuation and fire-fighting.

The Extended Corridor System is generally unaffected by external wind pressures, so is inherently more reliable than a natural system.

The Extended Corridor System achieves exceptional smoke extraction performance by utilising a corridor extraction system (corridor ventilation system) at one end of the corridor and a dedicated air inlet system at the other.

There are four types of Extended Corridor System:

(a)   Pull system – mechanical extract / natural inlet – outlet

(b)   Push system - mechanical extract / natural inlet

(c)    Push-pull – balanced system.

(d)   Push-pull reversible - balanced system but with added flexibility.




The Colt Extended Corridor System comprises:

  • For extract, duty and standby extract fans rated at 300°C for 1 hour
  • If inlet is by using a mechanical shaft, then duty and standby fans, ambient rated
  • Colt Seefire duct termination
  • Colt Seefire stairwell ventilator
  • Ducting to link builders work shaft to fans and duct termination
  • Either a motorised smoke damper and grille or a Defender F flap ventilator to each corridor (minimum E30S rated)
  • Main control panel plus mimic panel for fire service use
  • MCC/Fan starter panel linked to main control panel
  • Smoke detector in the corridor at each level

Builders work requirements

The builders work shaft is to be substantially straight, vertical and directly adjacent to the lobbies. The construction is to have a smooth internal face and minimum air leakage. The internal cross section is to be no less than 0.6m² and the aspect ratio no greater than 2:1.

The fire door between the lobby and the accommodation will be fitted with smoke seals (FD30S rating).

Please note that it is possible that the ducting is in a location that requires fire rated ducting.

System Control (typical specification)

1 central addressable panel to be supplied [per building]. This will then be linked to a central MCC panel which shall operate the relevant supply and exhaust fans.

For means of escape (automatic) mode the smoke detection system shall provide initial operation of the smoke control system and set up in automatic mode. Upon activation of the smoke detection system it will signal to the smoke control panel which residential floor is in fire mode.

Upon receipt of this initial signal, the smoke control panel will undertake control of the system. The Control Panel will establish which Damper needs to be activated. This will also send a signal to the fan control panels to start the fan operation.

Design work

A full design report including all calculations and CFD analyses shall be provided for submission to Building Control prior to installation. This shall include a detailed comparison of the performance of the mechanical solution with a standard wall mounted AOV to validate the suitability of the design for the application.

Scope of work

A full generic design report shall be provided for submission to Building Control prior to installation.

The design, manufacture, installation, wiring and commissioning of the complete system, including associated ductwork, shall be carried out by one specialist company and their approved sub-contractors. The specialist company shall be responsible for demonstrating and gaining Building Control approval for the ventilation system.

The specialist company shall be a BSI registered firm for the design, manufacture, installation and commissioning of smoke control systems in accordance with ISO 9000. Proof of certification shall be provided with tender submission.

The system will require annual maintenance and testing. The supplier shall include in the tender for a service visit and system test to be carried out one year after the system hand over.

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