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How to Properly Size an Air Purifier for Your Home

Are you struggling with poor indoor air quality? If you want to breathe easier in your home, an air purifier could be the answer. However, not just any model will do. The key to improving air quality lies in selecting the right size for your space. This blog post will guide you through the science of air purifier sizing, equipping you with the essential knowledge to make an informed choice.

Understanding Air Purifier Sizing

Understanding Air Purifier Sizing


Austin Air Systems Air Purifiers

Choosing the right size air purifier is vital for its effectiveness in removing dust, pollen, smoke, and other harmful particles. An air purifier that is too small will work overtime and may not clean the air efficiently. Conversely, one that is too large may waste energy and produce too much noise.


Air purifiers use a measurement called the clean air delivery rate (CADR) to indicate how effectively they can filter specific pollutants. Familiarizing yourself with your room's size and how it relates to the CADR rating is necessary for optimal air quality.


Measuring Your Space


Measuring the room where the air purifier will be used is the first step toward finding the right match.


  1. Room Dimensions: Calculate the square footage by multiplying the length by the width. For instance, a room measuring 15 feet by 12 feet has a total area of 180 square feet.

  2. Ceiling Height: Consider that most air purifiers are tested at a standard 8-foot ceiling height. If your room has a higher ceiling, you may need a unit that can handle additional air volume effectively.


  3. Purifying Needs: Identify specific concerns for each room. For example, living rooms often have more foot traffic and airborne dust, while spaces like nurseries might need quieter options for peaceful napping.


Combining these measurements and considerations will help you determine the CADR rating required for your air purifier.


Calculating CADR


Understanding the CADR rating is crucial for selecting a model that meets your air cleaning needs.


  1. General Rule: As a rule of thumb, aim for a CADR that is at least two-thirds of your room's size in square feet. So for a 180-square-foot room, a CADR of about 120 is ideal.


  2. Pollutant Type: Different types of pollutants require different levels of CADR. For example, if pollen is the main concern, look for a unit with a higher CADR specifically rated for pollen.


  3. Room Usage: In busy areas, like family rooms, it’s wise to get a purifier with a higher CADR. However, for quieter spaces, such as bedrooms, you can go for a model with a lower CADR.


By calculating the CADR needed based on your space and specific air quality issues, you'll find the right air purifier for your needs.


What Factors to Consider Beyond Size?


While size is crucial, other factors influence your air purifier's effectiveness:

Molekule Air Purifiers

  1. Filter Type: Opt for models with high-efficiency particulate air (HEPA) filters, which can trap 99.97% of particles that are 0.3 microns or larger. This includes pollen, pet dander, and mold spores.


  2. Air Changes Per Hour (ACH): ACH measures how often the air purifier can filter the entire volume of air in a room in one hour. Aim for a minimum of 4 ACH for effective air purification. For example, if a unit can handle 200 square feet with a CADR of 144, it would provide 5 ACH.


  3. Noise Level: Check the noise levels for different fan speeds. If you plan on using the air purifier in a bedroom, choose a model that operates quietly, ideally below 30 decibels on low settings.


  4. Maintenance and Filters: Be aware of the replacement costs of filters. Some units may have a higher purchase price but offer longer-lasting filters that could save you money over time.


Overall, taking these elements into account will help you select an air purifier that meets your needs.


Popular Air Purifier Brands and Models


If you’re exploring options, consider these reputable brands:


Austin Air Systems: This brand specializes in air purifiers that excel at removing volatile organic compounds (VOCs), making them suitable for specific indoor air quality concerns.



AirDoctor: Known for powerful filtration capabilities, AirDoctor's models can address a variety of airborne toxins in both small and large spaces.




Molekule: With innovative technology that targets pollutants at a molecular level, Molekule is ideal for those looking for cutting-edge air purification solutions.



Each of these brands offers different models crafted for various room sizes and air quality challenges.


Final Thoughts


Fresh Air Matters offers an extensive selection of clinically proven top-brand air purifiers to help you create a healthy indoor environment by cleaning your air. Choosing the right air purifier for your home is essential for your family's health. By understanding how to size an air purifier correctly—from calculating room dimensions to assessing CADR ratings—you can select a unit that best fits your living environment.


Additionally, keep in mind factors like filter types, ACH rates, noise levels, and maintenance costs to enhance your air purification experience. Investing in quality air purification can dramatically improve your indoor air, leading to a healthier home.


By taking the time to learn about air purifier sizing and functionality, you empower yourself to choose a product that will help create a fresh and safe atmosphere for you and your loved ones.



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