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In fire protection, the term K-factor refers to the measure of the flow and pressure of water through the orifice of a fire sprinkler head. The characteristics of the orifice are used to determine the k-factor and include the diameter of the orifice, flow rate and water through the orifice.

The K-factor is different between Metric and US Imperial and the are not equivalent or interchangeable.


In preparing this definition, we have drawn from various sources including Legislation, Codes, Standards and industry information, research and knowledge.  Like the english language, these definitions may subtly change from time to time. As such these definitions are provided solely on the basis that users will be responsible for making their own assessment of the definition and and are advised to verify all relevant representations, statements and information.