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Natural Smoke Shaft System

A system to provide smoke and heat extract ventilation in accordance with BS 7346-4 and to comply with Building Regulations. Suitable for commercial and residential applications. CE Marked and compliant to applicable European Regulations.

OS Loop coordinator:

A modular smoke control system linking 1–64 remotely mounted manual control points (MCP's) via a coordinator. The coordinator contains the mains power conversion electronics which provides the 24 V DC power for operation. It also contains a back up battery supply. Each MCP contains actuator circuitry which also monitors actuator cabling and circuitry for faults. When a fault occurs a signal is went to the coordinator and from there to the remote alarms.

OS2 Control panel:

Suitable for standalone systems through to fully networked intelligent SHEV systems with BMS interface. Operates on a mains voltage primary power supply and contains integral fully monitored and intelligent battery backup for secondary power operation.


The OSLoop Control System continuously monitors all components within the SHEVTEC® system for their status. Should any component device develop a fault then this will be indicated on the relevant manual control point via a yellow LED. Audible warnings can also be initiated. For centralised indication of status and faults (for example in a designated Fire Fighters entrance) the SHEVTEC® Repeater Panel should be used.

The OSLoop system includes real-time event logging. This enables the system to indicate when maintenance is required and gives the maintenance engineer full diagnostics if required.


Tested to the principles of EN 12101-2.

General information
Specification data - Smoke and heat exhaust ventilation systems

Product Reference

Natural Smoke Shaft System

Shaft inlets


SHEVTEC® Smoke Shaft Door Actuator and Door, as section L20


Builder's work



SHEVTEC® Roof Vents And Louvres, as section L10

SHEVTEC® Glazed Louvre, as section L10


Manual control point (MCP)

Allow the smoke control system to be manually overridden.

Smoke detector

Required to meet Building regulations. The detectors must solely be used to activate the SHEV.

24 V Controllers

OS loop coordinator

OS2 control panel



SHEVTEC® Repeater Panel

Provides system status information for each vent within a smoke ventilation system, as described in section U14.

SHEVTEC® Smoke Shaft Floor Grille

Safety grilles to facilitate maintenance access with the smoke shaft.

Product Options

Shaft inlets:

  • SHEVTEC® Dampers as section U14.
  • SHEVTEC® Smoke Shaft Door Actuator and Door as section L20.

Third party certifications
  • BS7346-8
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