Tunnel ventilation dampers are designed for
use in enclosed road or metro tunnels where ventilation fans are needed
to supplement natural ventilation.
The fans and dampers control temperature
and pollution levels and they also play a vital role in controlling the
direction of airflow and smoke should there be a fire.
Emergency ventilation allows rapid removal
of smoke and heat so that the tunnel can be evacuated and fire fighters
can gain access as quickly as possible.
The ventilation dampers are fitted with
pneumatic or electric actuators that must be able to operate at elevated
temperatures for a given time. They have a safety feature that allows
them to assume a pre-defined fail-safe position should the power fail.
The dampers and their actuation devices are tested to appropriate
K Controls manufactures the
007HT switchbox to monitor the position of such dampers from a remote
They are usually directly mounted to a damper shaft and
not to the actuator.
The 007HT has passed a formal fire test at 300 degrees C
for 1 hour and is also suitable for 200 degrees C for more than 2 hours.
A client has also successfully fire tested
the product at 400 degrees C for 15 minutes in order to meet a specific
requirement. The product is field proven and has been tested
successfully beyond 1 million operations.
reference list of K Controls fire protection industry clients is
available on request.