In a hospital setting if for example a kitchen is identified and constructed as a hazardous area are storage rooms within need to be constructed as hazardous areas?
If depends if the kitchen is adequately ventilated or not, how is the ventilation, and the way that both areas are communicated. Keep in mind that if you are seen this in this way it is because any flammable gas, liquid, vapor or combustible dust are not storage in those rooms. in other case you should evaluate the classification for each material and also the extension of area due to the source in the kitchen
I am going to infer this is an exiting health care occupancy requiring compliance to the 2012 NFPA 101 for this discussion.
Based on Section 18.104.22.168, the kitchen would not be evaluated with respect to 22.214.171.124. The compliance evaluation must consider this phrase "shall not cause".
Excerpts from the 2012 NFPA 101:
...are storage rooms within need to be constructed as hazardous areas?
Yes. Each storage room in an existing health care occupancy must comply with 19.3.2 Protection from Hazards.
Mr. Werner, thanks for your quick reply. To follow-up on my original question, if the kitchen is already constructed as a hazardous area (existing healthcare) and there is a storage room within this kitchen that is larger than 50 ft2 used for storage of combustible supplies (126.96.36.199.4(7)) does the storage room need to be considered a hazardous area.
The fundamental fire protection concept of protecting against known hazards is either to confine the fire to the room of origin by means of fire-rated construction or to suppress the fire via an automatic extinguishment system.
The effects of fire originating in hazardous areas are minimized by isolating those areas that have a high potential for fire or a high fuel load in accordance with 188.8.131.52. Section 19.3.2 identify the particular hazards against which protection is to be provided.
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