![]() The minimum operating pressure for a K-16.8 for buildings OVER 35 feet tall is 52 PSI. The good news is that some ESFR sprinkler heads like the ESFR K-16.8 have a lessor minimum operating pressure for buildings OVER 35 feet tall. If you are required to change out your system based on this new requirement, you might be changing to a sprinkler head such as an ESFR K-16.8.Any existing systems that you may have that are utilizing ESFR K-14 sprinkler heads have been designed to have a minimum operating pressure of 75 PSI for buildings OVER 35 feet tall.If you are required to change out your existing K-14 ESFR sprinkler heads, there are a few things that you need to consider: To know more about what will trigger a retrofit, contact VFS. Typically the AHJ’s will require you to retrofit your building to the new NFPA standards if and when the following occurs: 1) a change of occupancy or 2) a remodel or modification to the building or the sprinkler system. The new height requirements do not affect ESFR sprinkler systems already installed. Will the Authorities Having Jurisdiction (AHJ) require me to retrofit my building? In this example, 35’-6” is the Maximum Ceiling/Roof Height in this building. ![]()
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