9.1. All supply and return air ducts at AHU room crossings and at all floor crossings shall be provided with approved make fire dampers of at least 90 minutes fire rating. 9.2. Fire damper blades....
9.1. All supply and return air ducts at AHU room crossings and at all floor crossings shall be provided with approved make fire dampers of at least 90 minutes fire rating.
9.2. Fire damper blades and outer frame shall be formed of 1.6 MM galvanised sheet steel. The damper blade shall be pivoted on both ends using chrome plated spindles in self lubricated bronze bushes. Stop seals will be provided on top and bottom of the damper housing made of 16 G galvanised sheet steel. For preventing smoke leakage side seals will be provided. In normal position damper blade shall be held in open position with the help of a spring held in position by fusible links of approved rating thereby providing maximum air passage without creating any noise of chatter.
9.3. The fire damper shall close due to temp rise in SA. Ducts thru the fusible links factory set at 165 Deg. F. micro switches with bakelite base will be provided to stop fan motor and give open and close signal at remote panel in case of fire.
9.4. The fire dampers shall be mounted in fire rated wall with s duct sleeve 600 MM long. The sleeve shall be factory fitted on fire damper. The joints at sleeve end shall be slip on type. Minimum thickness of GI sheets shall be 18G.
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