Type : Tunnel Ventilation Smoke Damper
Leakage Rating : Class II as per UL555S
Blade : Aerofoil Type
Construction : Galvanized Steel (GI)
BETEC CAD’s Tunnel Ventilation Dampers are designed to isolate sections of a ventilation system with very high level of sealing. The dampers are mounted in side of the tunnel or at
tunnel ends to control the pressurized air, air intake and smoke exhaust in long tunnels without intermediate supplies.
In emergency situations , for fire and smoke control, the dampers pressurize the tunnel for safe egress of train, automobile, passengers to escape and creates a negative pressure in the area of the fire to remove smoke and gases.
BETEC CAD’s Tunnel Ventilation Dampers are heavy duty and robust dampers requiring less maintenance and are suitable for high humidity, high pressure, dust laden environments making them ideal for installation and operation in Tunnels, Oil & Gas, Marine and Nuclear applications.
Data
Damper Ratings
Leakage Rating : Class II @ 350° F as per UL 555S
Air Velocity : 3000 fpm (15.2 m/sec)
Pressure : 6″ water gauge (1.5 KPa)
Additional Test Ratings
Operational Rating : 250° C for 1 hours. (as per HKFSD)
Fatigue Cycles : 30 pressure reversal cycles @ 3Kpa
Max . Holding Pressure : 20” W.g (5Kpa)
UL Verification Service
Air Velocity : 4400 fpm @ ambient
Pressure : 12″ water gauge (3 KPa) @ ambient
Leakage Rating : Class I as per UL 555S
Standard Construction
Frame
14 gauge (2 mm) thick galvanized steel sheet with 2″ (50mm) external flanges.
Blades
Aerofoil blades of 14 gauge (2 mm) thick roll formed galvanized steel.
Blade Seals
300°C high temp, resistant Silicon rubber blade seals.
Jamb Seals
Stainless steel.
Bearings
High temperature resistant concealed ball bearings.
Axle
¾” (19 mm) diameter.
Actuator
Electric spring return type with inbuilt limit switches.
Pressure drop for Dampers
- Pressure drop and resistance of multi- leaf damper is a function of airspeed and varies in relation to the system’s total pressure.
- The pressure drop is indicated in graph for opposed blade damper in 100 % open position.
- The pressure drop indicated is the difference in measured pressure before and after the damper.
