# Filter pressure-drop allowance
# Scope: Linear pressure-rise interpolation from supplied measured clean/end points.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

clean = 50 Pa
loaded = 200 Pa
fraction = 0.5

pressure := clean+(loaded-clean)*fraction [Pa]

check filter change threshold: pressure <= 150 Pa

scenario alternative: clean = 40 Pa