Levoit VeSync Core Pro 400S User Manual page 14

ABOUT THE FILTER (CONT.)
Clean Air Delivery Rate
This air purifier has a Clean Air Delivery Rate of
260 cubic feet per minute (CFM), or 442 m³/h.
Clean Air Delivery Rate (CADR) measures the
efficiency of an air purifier by indicating the
volume of clean air that an air purifier produces
per minute. This is based on removal of dust,
pollen, and smoke, which are the 3 most
common indoor air pollutants. The higher the
CADR, the more particles the air purifier will
remove and the larger the area it can clean.
The rating is measured at the air purifier's
highest speed.
Air Change Per Hour
The air change rate is how many times
all of the air in a room can be purified (or
"changed") by the air purifier in 1 hour. Air
changes per hour (ACH) are calculated with
the recommended room size assuming 8 ft
/ 2.4 m ceilings. For smaller rooms, the air
change per hour will increase. This air purifier
can change air 5 times per hour at the max
speed in a single, closed room up to 403
ft² / 37 m². This is measured at ACH 5. The
air purifier is effective for larger rooms, but
air purification will take longer, with fewer
air changes per hour. For example, the air
purifier's effective range is 990 ft² / 92 m²
based on 2 ACH, or purifying the air in the
room 2 times per hour.
Note: To effectively clean air, keep windows
and doors closed while the air purifier is on.
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Humidity
Moisture may damage the filter. This air
purifier should be used in an area with a
humidity level below 85% RH. If you use the
air purifier in excessively humid areas, the
surface of the filter may become moldy.
Note: Water or moisture will allow mold to
grow. To solve a mold problem, get rid of
the source of the moisture and clean up
the mold.
Essential Oils
Do not add essential oils to the air purifier or
filter. The filter will become damaged by the
oil and will eventually release an unpleasant
smell. Do not use diffusers near the air
purifier.