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# What is a good CADR?

By: Alexander HuszaghUpdated: March 29, 2021

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If the air filter has 200 cfm and 75% efficiency the CADR would be 150. The CADR is a good way to keep from being misled in marketing messages. For example, if a filter has a very high filter efficiency but low air flow the CADR helps to balance the two.

Clean Air Delivery Rate

Clean Air Delivery Rate (CADR) is the performance metric for this standard. It indicates an air filter's ability to reduce smoke, dust, and pollen particles between the range of 0.10 to 11 micron. As a comparison, a strand of human hair is around 100 microns in diameter.

How do you calculate Cadr for air purifier?

For example, a 100 CADR air cleaner will then clean a room size of 155 sq ft. To go the other way, that is to know your room size and to find the right CADR you would then divide your room square footage by 1.55. Say your room is 250 sq ft. Divide this by 1.55 and you get 161.

Are air purifiers a waste of money?

Air purifiers are not a waste of money. and trips to the doctor to get relief from sinus and allergy symptoms, Comparatively, an air purifier is well worth the money. My guess is that most people just do not realize how well air purifiers really work these days.

## Related

The CADR is basically a reflection of the air flow (CFM) times the efficiency of the air filter. So, if an air filter has 200 cfm and 100% efficiency the CADR would be 200. For example, if a filter has a very high filter efficiency but low air flow the CADR helps to balance the two.

CADR is measured in cfm or cubic feet per minute in the US. For example, if the air purifier produces 100 cfm and the filter removes 90% of particles (efficiency) then the CADR for the air purifier will be 90. 100 times 90%.

### What is the best air purifier on the market?

The Best Air Purifier
• Our pick. Coway AP-1512HH Mighty. Effective, efficient, and inexpensive.
• Runner-up. Coway Airmega 200M. Different look, same great performance.
• Also great. Blueair Blue Pure 211+ A stellar performer for larger rooms.
• Budget pick. Blueair Blue Pure 411. Small, effective, and attractive.
• Also great. Austin Air HealthMate HM400.

### Are air purifiers worth it?

An air purifier can only remove allergens while they're floating in the air. Because the health benefits from using air purifiers vary from person to person and depend on the types of pollutants in your home, it's ultimately your call if paying for—and running—an air purifier is worth it.

### Where should I place my air purifier?

Place the air purifier where the air can circulate freely in, out, and around the unit, away from walls, furniture and other objects that may stop the air flow. Recommendations for the placement of your air purifier: Place it at least 10 cm/4 inches away from any potential obstacles. Avoid corners.

### What is the best air purifier for allergies?

The Best Air Purifiers for Allergies
• Honeywell HPA300 True HEPA Allergen Remover.
• GermGuardian AC4825 3-in-1 Air Cleaning System.
• LEVOIT HEPA Air Purifier.
• Hamilton Beach TrueAir Allergen-Reducing Ultra Quiet Air Cleaner Purifier with Permanent HEPA Filter.
• Coway AP-1512HH Mighty Air Purifier with True HEPA and Eco Mode.

### What does a HEPA filter do?

HEPA stands for high-efficiency particulate air. A HEPA filter is a type of mechanical air filter; it works by forcing air through a fine mesh that traps harmful particles such as pollen, pet dander, dust mites, and tobacco smoke.

### Do air purifiers really work?

So, do air purifiers work? Yes, they are able to trap a high percentage of the airborne allergens and irritants that flow through the filters. However, remember that an air purifier is only one step in getting rid of dust, mold, Volatile Organic Compounds, smoke odor, pet dander, or pollen.

### How do you measure a room for air purifier?

Of course, to calculate square footage you measure the length and width of your room in feet. Then multiply the two numbers to get the square footage. In using the CADR rating to determine whether an air purifier can clean the size of your room is pretty straightforward using the table above.

### Do air purifiers help smoke?

High-quality home air purifiers with activated carbon help immensely with both cigarette smoke and odor. While eliminating the source of smoke is the best method of maintaining clean indoor air, HEPA air purifiers can greatly reduce smoke and secondhand smoke in your living space.

### What is smoke CADR rating?

The higher the CADR number, the more air it filters per minute for that particle size range. Consumers can use these ratings to compare air cleaners from the various manufacturers. The defined particle size ranges are 0.09–1.0 µm for smoke, 0.5–3 µm for dust, and 5–11 µm for pollen.

### How do you calculate square footage of an air purifier?

Of course, to calculate square footage you measure the length and width of your room in feet. Then multiply the two numbers to get the square footage. In using the CADR rating to determine whether an air purifier can clean the size of your room is pretty straightforward using the table above.

Clean Air Delivery Rate

### What is AHAM certified?

AHAM certified air purifiers and air cleaners have been tested and rated by AHAM (Association of Home Appliance Manufacturers) for their ability to clean tobacco smoke, dust, and pollen from a room.

### Will a large air purifier work in a small room?

Answer: Dear Deborah, A large air purifier, or air cleaner, will work in multiple rooms if they're fairly open to each other. If one of the rooms has closed doors, a large air purifier won't work to clean the air in other rooms.

### What is the full form of CADR?

Clean Air Delivery Rate (CADR) is a figure of merit that is the cubic feet per minute (CFM) of air that has had all the particles of a given size distribution removed.