That standard is the Freeman Ratio, developed by John Freeman in the late 1800’s and still very relevant today, states that the nozzle orifice diameter should be half of the hose diameter. Dennis also speaks to finding balance with the Freeman Ratio and hose construction as well as nozzle reaction.
Dave McGrail is a 36-year veteran of the fire service and an Assistant Chief with the Denver Fire Department. He instructs internationally on a wide range of fire service topics, specializing in high-rise firefighting operations. He is the author of the book Firefighting Operations in High-Rise and Standpipe Equipped Buildings published by PennWell (Fire Engineering Books and Videos) in 2007. Dave holds two Associate of Applied Science Degrees in Fire Science Technology, one with a focus in Fire Suppression, and the other with a focus in Fire Prevention. Dave also holds two Bachelor of Science Degrees, one in Human Resource Management, and the other in Fire Service Administration.View All Videos
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