Page 93
Version 2023-06-15
Fire damper - FDMR
TPM 140/19
VII. MATERIAL, FINISHING
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Damper casings are made from galvanized sheet metal without further surface treatment.
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Damper blades are made from fire resistant asbestos free boards made of mineral fibres.
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Manual control have cover made of mechanically resistant and durable plastic and the other parts are galvanized without
further surface treatment.
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Thermal fuses are made of sheet brass, thickness 0,5 mm.
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Fasteners and springs are galvanized.
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According to the customer's requirements, dampers can be made of stainless steel material.
Specifications for stainless-steel design:
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Class A2 – Food-grade stainless steel (AISI 304 – EN 1.4301)
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Class A4 – Chemistry-grade stainless steel (AISI 316, 316L – EN 1.4401, EN 1.4404)
The respective stainless steel is the material for all components that are located or entering the damper inner space;
components outside the damper casing are typically from galvanised sheet metal (fasteners for mounting the actuator or
manual control, mechanical components except Item 4), frame components.
The following components, including the fasteners, are made from stainless steel at all times:
1)
Damper casing and all components permanently attached
2)
Blade holders including pins, metal parts of blades
3)
Control components inside the damper (L-profile, pin with lever, rod, fasteners)
4)
Parts of a manual contol entering the inner space of a damper casing (lower sheet of a manual control, lock holder “1”,
lock lever “2”, closing spring, 8 dia. stopper pin, manual control pin)
5)
Inspection opening cover including the stirrup and fasteners (if they are parts of the cover)
6)
Bearing for torque transfer from the lever with pin on the blade L-profile (made from AISI 440C)
The damper blade is made from a board of homogeneous material Promatect-H or Promatect-MST, thickness according to
damper diameter or is composite from two boards of Promatect-H, thickness 20 mm, connected with galvanised nailed “U”
connectors which are sealed with Promat K84 from the outside.
Thermal fuse is identical for all material variants of the dampers. Upon specification by customer, the thermal fuse can be
made from A4 from stainless steel sheet metal.
Thermoelectric activation device BAT is modified for stainless-steel variant of the dampers; standard galvanised screws are
replaced with stainless-steel M4 screws of corresponding class. Damper casing has stainless-steel riveting M4 nuts.
Plastic, rubber and silicon components, sealants, foaming tapes, 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 only available in one class of stainless steel; the type will be used in all stainless-steel
variants.
The damper blade in the variant for chemical environments (Class A4) is always treated with a coating of chemically
resistant Promat SR.
Any other requirements for the design will be considered atypical and will be addressed on an individual basis.
