Views: 237 Author: Site Editor Publish Time: 2026-07-28 Origin: Site
CADR (Clean Air Delivery Rate) measures how quickly an air purifier can remove airborne particles from indoor air.
It indicates the volume of clean air an air purifier delivers every minute or hour. A higher CADR generally means the purifier can clean a room faster.
CADR is one of the most widely recognized performance indicators when comparing air purifiers.
CADR evaluates an air purifier's ability to remove three common airborne pollutants:
Some manufacturers also publish CADR values specifically for PM2.5 or fine particulate matter, although traditional CADR testing focuses on the three categories above.
Here is the Airdog X5 air purifier, PM2.5 Concentration Monitored in Clean Air Delivery Rate(CADR) test. In 15 minutes, the removal rate is 96.9%.
CADR combines two key factors:
1. Airflow
How much air passes through the purifier.
2. Filtration Efficiency
How effectively the purifier removes particles from that airflow.
A purifier with:
High airflow but poor filtration
or excellent filtration but very low airflow
may still have a moderate CADR.
The best air purifiers balance both airflow and filtration efficiency.
A higher CADR means:
Faster air cleaning
Better performance in larger rooms
More rapid reduction of airborne particles
Improved indoor air quality
For example:
(Actual room coverage also depends on ceiling height and desired air changes per hour.)
Not necessarily.
While CADR is an important benchmark, it does not measure everything.
CADR mainly reflects how quickly particles are removed from the air. It does not directly evaluate:
Removal of odors
VOC reduction
Formaldehyde removal
Long-term filtration efficiency
Filter lifespan
Noise level
Energy consumption
Maintenance cost
When selecting an air purifier, CADR should be considered together with other performance indicators.
Especially for the current HEPA filters, after long-term operation and usage, the HEPA filter surfaces are clogged with particles, hairs, and other substances, and the efficiency of air circulation will significantly decrease.
Therefore, it is necessary to replace the HEPA filter. However, there is another air purification technology called Airdog TPA, which can effectively prevent filter blockage. It only requires water washing and drying, and can be reused repeatedly without any impact on efficiency.
No.
CADR measures the removal rate of airborne particles under standardized testing conditions.
Although viruses and bacteria can attach to airborne particles, CADR itself is not a direct measurement of pathogen removal.
Manufacturers should provide separate laboratory test reports if they claim virus or bacteria removal performance.
The ideal CADR depends on room size.
General recommendations:
If you have:
pets
allergies
asthma
smokers
wildfire smoke
choosing a higher CADR can improve air cleaning speed.
Yes.
CADR is a performance metric, not a filtration technology.
Both HEPA air purifiers and electrostatic air purifiers can be tested and rated using CADR.
The difference lies in how they achieve that performance.
For example:
HEPA purifiers capture particles using dense mechanical filters.
Electrostatic purification systems remove particles through electrostatic attraction.
If two air purifiers have the same CADR, they may clean the air at a similar speed under test conditions, while differing in maintenance requirements, pressure drop, energy efficiency, and filter replacement costs.
CADR stands for Clean Air Delivery Rate.
It measures how quickly an air purifier removes airborne particles.
A higher CADR generally means faster air cleaning.
CADR is useful for comparing purification speed but does not represent overall product quality.
Room size, filtration technology, maintenance costs, noise level, and energy efficiency should also be considered when choosing an air purifier.
