Panasonic F-YAV28H Operating Instructions Manual page 9

(Displayed on the "Front Display")
Front Display
If the deodorant filter and HEPA dust filter are not installed on the body, the value detected
by the PM2.5 sensor may be inaccurate.
PM2.5/PM1.0
The concentration detected by the PM2.5 sensor may be different from the data detected by other devices.
The color of PM1.0 changes according to the color currently displayed by the PM2.5 sensor.
9
YAV28H