AHAM’s standard for measuring an air cleaner’s efficacy is called the Clean Air Delivery Rate (CADR). CADR indicates the volume of filtered air an air cleaner delivers, with separate scores for tobacco smoke, pollen and dust. The higher the CADR number for each pollutant, the faster the unit filters the air.
What is a good CADR for air purifiers?
A good CADR rating is equal to at least two-thirds of the room’s area. For example, a room that measures 10 feet by 15 feet has an area of 150 square feet. Therefore, a good CADR rating for an air purifier would be a smoke CADR of at least 100.
Is a higher CADR better?
The higher the CADR test numbers, the better the unit’s overall ability to clean indoor air. For example, if an air purifier has a CADR of 388 for tobacco smoke particles, it will reduce smoke particle levels to the same concentration as would be achieved by adding 380 cubic feet of 100% clean air per minute.
What is the best CADR rating?
Room air purifiers with HEPA filters often achieve the highest CADR. In our tests, a CADR above 240 receives an Excellent rating; 240 to 180, Very Good; 179 to 120, Good; 119 to 60, Fair; and anything under 60 earns a rating of Poor. There are different CADR ratings for removing tobacco smoke, dust, and pollen.
What CADR do I need?
Generally, the CADR of your air purifier should be equal to at least two-thirds of the room’s area. So, for example, a room that is 15 feet by 10 feet has an area of 150 square feet. ⅔ of 150 is 100, so an air cleaner for that room should have a smoke CADR of at least 100.
What CADR rating do I need for Covid?
Experts recommend a MERV rating of 13 or higher for control of COVID-19 if the building systems can function with that level of filtration. Filters with a MERV of 13 and above are required to demonstrate at least 50% removal efficiency for the smallest particles tested.
Why is CADR important?
Why is CADR important? It is important if you are concerned with the performance of an air cleaner. It will let you know whether the air purifier is strong enough to clean your living area. If an air purifier doesn’t have enough air flow it won’t be effective in cleaning your room.
Does CADR matter in air purifier?
The truth is, it doesn’t matter. CADR should be used for only one thing: to approximate CFM. CFM is actually helpful. CFM, of course, stands for Cubic Feet per Minute – it gives a standard way to describe how much air (cubic feet) is processed by an air purifier in a given period of time (a minute).
Is CADR misleading?
Why CADR Ratings are Misleading. … As two variables are used to calculate the CADR, an increase in one can offset a decrease in the other—but still result in an higher CADR rate. The CADR is meant to be impartial and is advertised as the the best way to compare air purifiers. However, it can be misleading.
Is CADR 158 good?
This means you will want a room air cleaner with a CADR of 160 or higher. AHAM recommends you use the smoke CADR to calculate the room square footage.
What air purifier has the highest CADR?
The 450 smoke CADR rating is the highest possible CADR rating an air purifier can get.
How do you convert CADR to CFM?
If your CADR value is given in CFM, you need to multiply the air purifier’s CADR rating by 60, to get it in hours. For example, if the CADR is 300cfm, the air purifier changes 300*60=18000 cubic feet of air per hour.
What is the full form of CADR?
The 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.
How do you calculate CADR for air purifier?
The air purifiers of regular manufacturers will be marked with CADR value (the amount of clean air per hour), and the applicable area = CADR×0.12 (0.12 is the conversion factor in the national air purifier standard), for example, the CADR of an air purifier is 500 Cubic meters/hour, applicable area=500*0.12=60 square …
What is H13 true HEPA?
HEPA is an acronym for high-efficiency particulate arrestance, or air filtration. … “A HEPA grade of H13 can remove 99.95% of all particles in the air measuring 0.2 microns in diameter, while a HEPA grade H14 removes 99.995%,” says Nagl. “The 0.2 micron is the most difficult size of a particle to capture,” explains Nagl.
What do the numbers mean on air purifier?
Three numbers are usually listed for each air purifier (one for tobacco smoke, one for pollen, and one for dust). The higher the tobacco smoke, pollen and dust numbers, the faster the unit filters the air. The CADR determines how well an air purifier reduces these pollutants.