If a water curtain is installed, what is the equivalent fire separation rating? any related code for a Water Curtain sprinkler spacing with a grid installed sprinkler spacing?
Is this in the United States??
Why the need for the rating?
A water curtain is used to prevent fires from spreading from one part of a building to the next. There is no equivalent fire resistant rating that I am aware.
While NFPA doesn't specifically indicate a fire rating related to the installation of a water curtain, the point is to prevent a fire from passing from one side of the water curtain to the other, thus a fire barrier. It therefore can be assumed, at the very least, that the rating would be equal to the minimum require water duration spelled out in Table 18.104.22.168.2 NFPA 13 2013 Edition.
Its testing limits and trying out new, often radical ideas that a water curtain could be defined as fire barrier in the application of the building safety codes.
Fire barriers in NFPA code have a specific meaning for the use in its application of the codes. There is no way a water curtain installed per NFPA 13 can used as a fire barrier to separate horizontal exits and hazardous areas in accordance with the NFPA codes.
Taken from the 2019 NFPA Glossary of Terms:
Fire Barrier - A continuous membrane or a membrane with discontinuities created by protected openings with a specified fire protection rating, where such membrane is designed and constructed with a specified fire resistance rating to limit the spread of fire. (SAF-FIR)
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