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airmega cadr rate based on room square footage

Airmega’s Clean Air Delivery Rate

CADR and CFM are two units of measurement that express an air purifier’s efficiency in cleaning the air. The two units are utilized to determine the maximum room coverage an air purifier can provide. 

CADR rating

The Association of Home Appliance Manufacturer’s standard for measuring an air cleaner’s efficacy is called the Clean Air Delivery Rate, often shortened to CADR. CADR indicates the volume of filtered air an air purifier 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. A good CADR rating should equal at least two-thirds of the room's area. So, for a room that is 99 square feet, a good CADR rating for an air purifier would be at least 66. 

Another measurement used to explain how fast an air purifying unit can filter the air is CFM. CFM stands for cubic feet per minute, and this number provides insight into the efficiency of the air purifier, namely how many cubic feet per minute this air purifier can scrub. At a high level, the biggest difference is that CFM is believed to provide a more accurate, and transparent reading on an air purifier's effectiveness to clean the air.

Using CADR and CFM to calculate room size

Before jumping into the math, it’s important to keep in mind that these calculations are based on the assumption that your room has an 8-foot high ceiling and your unit is running at its highest fan speed. 

How big of a room can my air purifier clean?

Method 1 - Using CADR to calculate maximum room size 

Maximum Room Size = CADR x 1.55

Using the Airmega AP-1512HH Mighty as an example, calculate room size as follows. This product has a CADR of 233. If we plug that into the above formula, we get a maximum room size of ~361 ft2

This means that in 12.5 minutes, the Mighty can fully clean the air of a 361 ft2. room on high fan speed. And, the longer it runs, the more air can clean! In just 30 minutes, the Mighty can fully clean the air in a room up to 874 ft2 in size. 

Method 2 - Using CFM to calculate maximum room size 

Maximum Room Size = (CFM x 60) ➗ (ACH x Room Ceiling Height)

Using the Airmega 400 as an example, calculate room size as follows. This product has a CFM of 416, and we’ll assume an ACH (air change rate per hour) of 4, and a ceiling height of 8 feet. If we plug that into the above formula, we get a maximum room size of 780 ft2. 

This means that in 15 minutes, the Airmega 400 can fully clean the air in a 780 ft2. room on high fan speed. And, in just 30 minutes, it can clean a space up to 1560 ft2 in size. 

Coway Airmega air purifiers 

Coway provides a huge range of products with varying coverages to fit any space, from living rooms and bedrooms to office buildings and retail spaces. Airmega offers powerful purification with intuitive features like Smart Mode, Eco Mode, Sleep Mode and more. To learn more about Airmega and shop for one of your own, visit



1Coway air purifiers have been proven to trap dust, pollen, dander, viruses and bacteria in the air based on KCL (Korea Conformity Laboratories) testing.They have been tested in a 30㎥ size chamber according to the Korea Air Cleaning Association standard (SPS-KACA 002-132:2022 Modified) to measure the 0.01㎛ size of particle removal rate. It was tested on maximum airflow speed in normal room temperature and humidity conditions. The performance may vary in the actual living environment of customers.
→ Tested with Airmega Aim, 100, 150, 160, AP-1216L, AP-1512HH, AP-1512HHS, 200M, Icon, IconS, 230, 240, 250, 250 Art, 250S, 300, 300S, 400, 400S, ProX

299.97% of viruses, bacteria, fungi and pollen were verified to be removed from the air for Coway air purifiers which have Green True HEPA™ filter applied based on the Japan Food Research Laboratories(JFRL) testing according to JEM 1467 standard.
→ Tested with Coway Airmega AP-1512HH, AP-1512HHS, 250, 250 Art, 250S, 300, 300S, 400, 400S
→ All tested by JFRL and received above result within below time.

All tested by JFRL and received above result within below time.

- Virus: Tested with Escherichia coli phage ΦX174 NBRC 103405, 60 minutes
- Bacteria: Tested with Staphylococcus epidermidis NBRC 12993, 60 minutes
- Fungi/Mold: Tested with Penicillium citrinum NBRC 6352, 60 minutes
- Pollen: Tested with Cedar Pollen extract, 60 minutes

3Aerosol test conducted in a Biosafety level 3 laboratory with two Coway air purifier models, Coway Airmega 250 and 400 for removal of SARS-CoV-2 Aerosol by US based MRI Global, a not-for-profit laboratory and partner of US Department of Defense. The test was conducted in a 13.1ft3 chamber. Virus was aerosolized for 15 minutes and the product was turned on high for 2 minutes. Result showed each product effectively removed over 99.98% of the SARS-CoV-2 in 2 minutes. This is a result from a laboratory experiment condition and result may vary in different conditions. This result does not imply it kills SARS-CoV-2 or prevents the transmission of Covid-19. Coway Airmega 250S and 400S are identical to the tested models and has equal performance with an additional mobile connectivity function.

4The concentration of ammonia, acetaldehyde and acetic acid were proven to be removed within 30 minutes by FCG Research Institute, Inc. Human Life Science Lab. It is not a demonstration result in the actual use space. Not all odors and gases may be supported. → Tested with Coway Airmega 150, 160, AP-1512HH, AP-1512HHS, 400, 400S

5The coverage area of the air purifier is based on an area where the air cleaner can make two air changes per hour (ACPH). An air change per hour translates to how many times an air purifier can clean an area, assuming the height of a ceiling to be 8 ft, in one hour. Therefore ** means two air changes per hour means that the cleaner can clean the area once every 30 minutes and * means air changes per hour means that the air purifier can clean the area once every 60 minutes.

10Terms and conditions apply. Discounts, including promotions, coupons, bundle discount and subscription discount, cannot be stacked on top of other coupons. During promotional periods, discount codes will not be able to be applied to orders. Promo codes may apply to products only—filters, accessories, and new products within 3 months of the release date are not included.