The 4 Best Air Purifier to Remove Radon (2025)
Findmyairpurifier
January 11, 2025
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Choosing the right size air purifier is crucial for maintaining clean, healthy air in your home or office. The size of your air purifier should match the size of the room you want to purify. I’ve shared a straightforward guide to help you determine the appropriate air purifier size for your needs.
Air purifiers come in various sizes, each designed to clean the air in spaces of different dimensions. To select the right size, you need to consider your room’s square footage, the air purifier’s Clean Air Delivery Rate (CADR), and several other factors that influence its effectiveness.
The key to effective air purification is matching the purifier's capacity to the room size. An undersized unit will struggle to clean the air efficiently, while an oversized one may waste energy and create unnecessary noise.
The first step in choosing the right air purifier size is to measure your room:
– Measure the length and width of the room in feet.
– Multiply these numbers to get the square footage.
For example, a room that is 15 feet long and 10 feet wide has an area of 150 square feet. If you have an open floor plan or want to purify multiple
connected rooms, measure each space separately and add the square footages together.
CADR is a crucial metric that indicates how quickly an air purifier can clean the air in a specific size room. It’s measured in cubic feet per minute (CFM) and is usually provided for three common pollutants: smoke, pollen, and dust.The Association of Home Appliance Manufacturers (AHAM) developed the CADR rating to help consumers compare air purifier performance. A higher CADR number indicates that the air purifier can clean a larger volume of air more quickly.
A general guideline recommended by ENERGY STAR is the “2/3 rule” – choose an air purifier with a CADR that is at least two-thirds of your room’s square footage. For instance, for a 150 square foot room, you’d need an air purifier with a CADR of at least 100.
Here’s a simple guide based on room size:
Another important factor to consider is the number of air changes per hour (ACH). ACH indicates how many times an air purifier can process the entire volume of air in a targeted space each hour.For general air purification, aim for at least 2 ACH. However, if you have allergies, asthma, or other respiratory issues, look for air purifiers that can provide at least 4 ACH. The Environmental Protection Agency (EPA) recommends air purifiers that provide at least 4.8 ACH for the recommended room size to help improve indoor air quality.
Consider these additional factors:
To determine the minimum CADR needed for your space, use this formula:
– Calculate the room’s volume (length x width x height) in cubic feet.
– Multiply the volume by the desired number of air changes per hour (ACH).
– Divide the result by 60 to get the minimum CADR in cubic feet per minute (CFM).
For example, for a room measuring 15′ x 10′ x 8′ with a desired 4 ACH:
– Volume = 15 x 10 x 8 = 1,200 cubic feet
– 1,200 x 4 = 4,800
– 4,800 / 60 = 80 CFM minimum CADR
Let’s calculate the CADR needed for an air purifier to clean a 30 by 30 feet space with 9-foot ceilings:
Choosing the right size air purifier ensures that you get clean, fresh air without wasting energy or money. Remember to measure your room, understand the CADR rating, consider the desired ACH, and take into account any special air quality needs you may have.
While it’s generally better to choose a slightly larger air purifier than a smaller one for versatility and efficiency, be mindful of energy consumption and noise levels. Many modern air purifiers come with adjustable fan speeds, allowing you to balance performance with energy use and noise output.
Remember that clean air is essential for good health, and with the right air purifier, you can breathe easier and enjoy a healthier living environment tailored to your specific needs.
Tayyabah Zahoor is an expert writer with a Bachelor's degree in Physics. She specializes in creating content for affiliate websites, particularly about air purifiers. Using her scientific knowledge, she compares different air purifiers by analyzing their features and effectiveness. This helps her provide clear and helpful information to consumers looking for the best options.