The type CFD-02TM High temperature tunnel damper has been designed for bolting / clamping directly onto walls and floors or bolting to steel support frames / ductwork.
Flamgard Calidair’s tunnel dampers are rigidly designed and are used to regulate the airflow in transit tunnels. They ensure that the air that is circulating through the tunnel is safe for passenger transit, without excessive build-up of exhaust gases. In normal conditions, tunnel dampers control the volumetric air flow in a transit tunnel.
In emergency fire conditions, it is essential that the dampers are there not only for ventilation, but to regulate the fire and the associated smoke and hot gases. Fires in tunnels generate severe smoke which, if not reliably ventilated, could cause those in the tunnel to suffer the life-threatening effects of smoke inhalation. Tunnel dampers can be used in emergency conditions to operate to extract these toxic fumes and smoke away from the critical area as well as providing a fire barrier when closed
Highly customisable controls configurations to enable optimised damper free area to ensure best use of tight site conditions, improving air flow and minimising pressure drop. Actuator locations can also be modified to achieve best accessibility for easy of commissioning and maintenance.
The damper casing is formed from 3.0 mm thick sheet steel into a rigid channel section to ensure proper alignment of blades and shafts. Damper units in excess of 2550mm width or 1900mm height shall be manufactured as a multiple assembly. Damper insertion depth is 300mm.
The blades are a formed double-skin aerofoil section of 2.0 mm sheet metal. Blade stops at the top and bottom of the casing and sprung side seals provide excellent low leakage characteristics. As an option, the blade ends can be capped and fitted with blade edge seals.
Continuous shafts are Ø 20mm. The blades are plug welded at each end.
Parallel action linkage consisting of drive levers connected by flat bar link bars, driven through stainless steel pins. All linkage is contained within the depth of the damper casing.
Phosphor bronze self-lubricated ‘Oilite’ flanged bushes.
Part | Material | Finishing |
Case | Mild Steel | Painted or Galvanised |
Case | Stainless Steel – 1.4307 (304L) Stainless Steel – 1.4404 (316L) |
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Blades | Mild Steel | Galvanised |
Blades | Stainless Steel – 1.4307 (304L) Stainless Steel – 1.4404 (316L) |
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Shafts | Stainless Steel – 1.4307 (304L) Stainless Steel – 1.4404 (316L) |
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Bearings | Phosphor Bronze ‘Oilite’ (Self Lubricating) | – |
The CFD-02TM dampers utilize a parallel or opposed linkage system to open and close the damper units and can be normally open or normally closed depending upon the requirement. The airflow through the Flamgard Calidair damper is bi-directional and the orientation can be vertical or horizontal.
Weights for specific sizes are issued on the quotation documents.