Fire damper Dimensions lindab | fire dampers WKS25 310 b de 22 c a 22 S2 S1 Description Rectangular fire damper for air duct system that penetrate fire resistance walls or floors. With 25 mm thick closing blade- made from refractory material. Casing leakage performance class C according to Standard EN1751:2014 section C.3. The damper prevents fire and smoke from spreading through the air duct system. Tested and classified in accordance with EN 1366-2 and EN 13501-3 with 500 Pa negative pressure and CE marked in accordance with EN 15650. Product code Type WKS Series 25 Manual command Command B type C M Position S0 indication S2 microswitches M0 Magnet MR Motorized Motor type Base (a) Height (b) MI VSS DSS VSB DSB TSB XYZ XYZ Rectangular fire damper Blade thickness 25 mm Manual command Compact manual command Manual command with magnet Without position microswitches With two position microswitches (included for MR/MI versions) Without magnet (only for command type “B” and “C”) With power supply interruption magnet through eletric board 24 V DC or 48 V DC With power supply input magnet through eletric board 24 V DC or 48 V DC Siemens motor GRA 126 (24V) Siemens motor GRA 326 (230V) Belimo motor BFL24T (24V) Belimo motor BFL230T (230V) Belimo motor BFL24T-ST (24V) Nominal dimension (mm) Nominal dimension (mm) a nom 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 b nom 200 250 300 350 400 450 500 550 600 All combinations of base (a) and height (b) dimensions are available. It is possible to pair two dampers for bigger duct dimension. b nom 200 250 300 350 400 450 500 550 600 S1 S2 (blade exposition) mm - 21,5 - 46,5 - 71,5 - 96,5 - 121,5 - 146,5 7,5 171,5 32,5 196,5 57,5 221,5 Ordering example Mechanism type Side a Side b Control mechanism WKS25 200 300 S2MR We reserve the right to make changes without prior notice 1
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