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- NON RETURN DAMPER
NON RETURN DAMPER
Description
Starduct non return damper , Model : S-RND frame is made of Z180 galvanized steel sheet, thickness 0.95 ~ 1.15mm on auto-production line for high unifomity. Blades optional flanges C/TDC/V3/V4 subject to damper sizes. Damper blade is 3V type, made of Z180 gal steel sheet, thickness 0.95 ~ 1.15mm, max. length 850mm. If damper width > 850mm, blades shall be divided by supporting steel U-channel.
Damper shafts are made of 10x10mm steel square bar. Shaft bushes are made of PPP plastic of bronze fixed in damper frame. Shaft and blade are joined weldlessly by pressing. Blades are linked together by an interlock mechanism of steel bars tha help blades running simultaneously when opening/closing.
Production standards : Complying with AMCA 500D; Test report No.10131/VLXD-TBMT, Test standard BS-EN 1751:1999
Scope of Test : Leakage of damper frame - Class A, leakage of damper blade -Class 1
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