Required Fire Flow

Formula and source

ISO Needed Fire Flow NFF = (C × O × X × P) where C = 18 × F × sqrt(A), F is construction-class factor, O is occupancy hazard, X is exposure factor, P is communication factor.

ISO Public Protection Classification (PPC) Schedule by name.

Audience

This tile is built for fire-ground and the adjacent professions in the Fire-Ground Engineering group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

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Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.