SEDM-L - Smoke extraction damper - multi
Page 54
Version 2022-12-20
TPM 157/22
III. MATERIAL, FINISHING
Material
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Damper casings and blades are made of fire resistant asbestos free boards made of mineral fibres.
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Damper bodies and blades can be coated with Promat 2000 anti-moisture coating or Promat-SR anti-aggressive coating.
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Fasteners are galvanized.
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According to the customer's requirements, damper can be made of stainless material.
Specifications for stainless-steel models – classification of stainless steel:
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Class A2 – Food-grade stainless steel (AISI 304 – EN 17240)
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Class A4 – Chemistry-grade stainless steel (AISI 316, 316L – EN 17346, 17349)
The respective stainless steel is the material for all components present or accessing the damper interior; components
outside the damper body are typically from galvanised sheet metal (fasteners for mounting the actuator).
The following components, including the fasteners, are made from stainless steel at all times:
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Damper body and all components permanently attached
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Blade´s holders, including pins, metal parts of blade
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Inspection hole cover and fasteners (if they are parts of the cover)
Everything that is located or enters the inner space or the cross-section of the damper is from a given stainless-steel
material. The parts located outside the body and in the damper mechanism space are made of galvanised material as
standard. In the case of the stainless-steel design, the cover grilles are always made of galvanised material with a
"powder-coated" coating.
Plastic, rubber and silicon components, sealants, foaming bands, glass-ceramic seals, housings, brass bearings of the blade,
actuators, and end switches are identical for all material variants of the dampers.
Some fasteners and components are available in one class of stainless steel; the type will be used in all stainless-steel
variants.
The blade in the variants for chemical environments (Class A4) is always treated with a coating of chemically resistant
Promat SR.
Any other requirements for the design shall be considered atypical and shall be addressed on an individual basis.
IV. INSPECTION, TESTING
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The appliance is constructed and preset by the manufacturer, its operation is dependent on proper installation and
adjustment.
