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Fire Dampers in wall less than 2 hrs fire rating

Question asked by Sandip Prakash Khairnar on Oct 4, 2015
Latest reply on Mar 14, 2016 by afraser

Dear Experts,


As per NFPA 90A (2015)* Approved fire dampers shall be provided where air ducts penetrate or terminate at openings in walls or partitions required to have a fire resistance rating of 2 hours or more.


Does it means the fire walls of rating less than 2 hrs (eg 1hr), shall not be provided with fire dampers irrespective of the hazard occupancy?

e.g. Do we need the fire dampers in case of the electrical room with 1 hr fire rated wall, with independent-dedicated HVAC unit?

Please Advice.