100% is a clean filter on your own system; 0% is the change point. The dashed line is where it's heading.
Filter Index
—
— in.w.c.
Filter ΔP — Vacuum
—inHg
— in.w.c.
Airflow through duct · est.
—CFM
— ft/min · —% of rated
Air temperature
—°F
Filter loading —%
Live duct schematic — airflow through the filter
Air moves left→right; particle rate & speed track the airflow estimated from the measured ΔP. Sense taps P₁/P₂ read the differential the sensor sees.
Waiting for live data
No readings from the sensor yet.
Measured ΔP over time
Filter ΔP (in.w.c.)real sensor readings
Air temperature over time
Air temp (°F)real sensor readings
Sensors side by side
Every sensor on one axis. Sensors sharing a filter should read the same — that’s the check.
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Live ΔP and temperature are real sensor measurements. Filter life, airflow (CFM), and loading are
figures derived from the measured ΔP. K&H Sensor Solutions.
FESCUESoftware & Design, Cut Close · EST. 2026
Reading log — —
Settings
Sensor
When to change the filter
Clean-filter baseline for this sensor: — in.w.c. (learned automatically).
Your system
These two only affect the estimated airflow numbers, never the filter-life percentage.