Tuesday, November 21, 2023

Milford NH has ISO 3/4 rating

https://www.milford.nh.gov/fire-department/pages/iso-ratings

ISO 3 in hydrant areas

ISO 4 in non hydrant areas

is that how ISO split ratings usually work? wasnt it 3 / 3x or 3 / 3y?
or is that functionally equivalent to 3/4?
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