# Fan and duct operating point
# Scope: Quadratic fan/system pressure intersection; supplied curve coefficients.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

shutoff = 300 Pa
fanCoefficient = 10000 Pa*s^2/m^6
systemCoefficient = 20000 Pa*s^2/m^6

flow := sqrt(shutoff/(fanCoefficient+systemCoefficient)) [m^3/s]
pressure := systemCoefficient*flow^2 [Pa]

check airflow target: flow >= 0.08 m^3/s

scenario alternative: shutoff = 240 Pa