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Question asked by dariozanut on Sep 27, 2018
Latest reply on Sep 28, 2018 by dariozanut

Referring to NFPA 90 A – Standard for the installation of Air-Conditioning and Ventilating Systems – at point it is specified that “approved fire dampers shall be provided in all air transfer openings in partitions that are required to have a fire resistance rating and in which other opening are required to be protected”.

Trying to understand the requirement exactly, I looked at figure A.5.3 – Application of Penetration Requirements – but no answer to my query  was found.

The case I’m facing concerns a transition opening on a 120 h fire rated external wall, where fresh air intakes are placed (refer to attachment 1.1).

In my understanding the external wall is not a “partition wall”, so it is not necessary to provide a fire damper, even if the wall is fire rated and also considering that it faces outdoors (refers to attachment 1.1 & 1.2).

Someone can please confirm the requirements for that specific application?