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Product Description and Features :
Introduction :
The BD Series Back Draught Damper is self-opening subject to air velocity
and is designed to restrict air back flow.
The damper can be fitted to partitions or brick walls, on plenums or
duct mounted.
Features :
* Standard case construction is galvanised mild steel
* Extruded aluminium blades
* Flange or spigot casing options
* Infinite sizing capability
* Unique blade end seal and stop (see chart)
* Variable blade position for alternate airflow direction
Specifications & Testing :
* Unless stated otherwise, flange models are suitable for classes A & B of DW144, with spigot models being suitable for classes A & B of DW144.
* Conforms to HVCA specification DW144 classes A
and B, and Eurovent as relevant
* Independent performance tests for pressure drop.
Test report 165 refers.
Blades :
The nominal 60mm wide standard extruded aluminium blades are fitted onto 6.25mm diameter spindles, complete with blade edge brush seal fitted as standard.
All blades are fitted for parallel operation only
Blades are linked with a precise linkage, alleviating movement and subsequent rattling of individual blades. Please refer to pressure drop figures for suitability.
Avoid use of dampers in extremely turbulent duct conditions. Although blade linkages will stabilise blades in most conditions, abnormal circumstances may cause dampers to malfunction.
Horizontal Applications
Where dampers are required to be installed in horizontal applications, blade limiting angle will be fitted to prevent locking in the open position.
When making an enqui l i , it i i t t t i f horizont l ti l iti .
Standard extruded aluminium blade Blade Spindles
Material Specification :
Casing
1.2mm (18swg) galvanised mild steel to BS EN 10142
1991. Coating Class Fe P02g.
Blade Bushes
Injection moulded nylonic engineered Nylon 66.
Jamb Seals (Optional)
Punched aluminium strip to BS1747 1987. 3.0mm (10swg) thick, that is also a combination blade stop in the open and closed position.
Blades
Extruded aluminium to BS1747 1987. Wall thickness
1.0mm (20swg).
Blade Spindles
IXEF semi-crystalline polymer polyarylamide.
Blade Limiting Angle
15 x 15 x 18 gauge galvanised steel running full length to one side only.
Paint
Aluminium primer is applied to all welds and ground surfaces.
Edge Seal
Nylon brush seal.
Performance and Application
Temperature: -10ľC to + 100ľC.
Velocity: 1m/s to 12m/s, horizontal airflow.
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