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Air Purifier Buyer's Guide

Why clean your air?

  • Clean air is good for our lungs, blood circulation, heart, and other health systems.
  • According to the EPA, your indoor air can be 2 to 5 times more polluted then the outdoor air.
  • Most people spend 80% of their day indoors.
  • The average person takes around 22,000 breaths each day.

No amount of healthy eating, organic products, vitamins, exercise, or filtered water can overcome putting polluntants into your body 22,000 times a day.

How to choose the right air purifier.

Choosing the right air purifier is about asking the right questions.

  1. What is the air quality issue you are wanting to solve? Allergens, Asthma triggers, Dust, Covid, VOCs, or odor?

  2. What is the size of the room where the unit will be used?

  3. What is your comfortable budget?

  4. Simple operations or more feedback and features?

  5. What type of filtration do we recommend?

  6. What other factors should you consider when making your decision?

Using Purafide For Example

Let's look at the Purafide XP280 & XP360 features.


  • Pre-filter for large particles, H13 HEPA for Allergens, Asthma, Dust, Covid-19, and other particles.
  • Carbon Filter & UV-C Light for odors, bacteria, virsuses, airbone mold, and VOCs.
  • Room coverage:
    • Up to 2,000 sq ft on turbo.
    • Up to 1,150 sq ft on medium speeds
    • Up to 550 sq ft on lower speeds
  • Provides more feedback with digital display, room air quality, tempature, and humidity readings.


  • Pre-filter for large particles, H13 HEPA for Allergens, Asthma, Dust, Covid-19, and other particles.
  • Optional Carbon Pre-Filter for light odors, bacteria, virsuses, and some VOCs.
  • Room coverage:
    • Up to 1,700 sq ft on high.
    • Up to 850 sq ft on medium
    • Up to 400 sq ft on low
  • Simple & Elegant push button controls.

What are Air Purifiers?

At a basic level, an air purifier cleans the air in your room.

It does this through different filtration processes that target microscopic particles that pose harm to your health.

Without an air purifier, your lungs ARE the air purifier, which is why so many people get sick.

Why buy an air purifier?

Air purifiers can help filter out pollen, airborne mold, pet dander, harmful particles, unpleasant odors, and other common irritants from your environment.

A high-quality air purifier can trap 99.9% of all air pollutants that would otherwise enter into your body and lungs.

Air purifier benefits

  • Helps protect against the effects of pollution
  • Helps reduce airbone allergens
  • Helps capture dust, pollen, and pet dander
  • Helps eliminate bacteria, viruses, and airbone mold spores
  • Helps reduce chemical fumes, VOCs, smoke, and odors
  • Circulates clean air, revitalizing your environment

What to consider when choosing an air purifier

  • Room size: A larger room requires a higher-capacity air purifier. Look for units with high CADR ratings.
  • HEPA filters: These filters help reduce common allergens, such as dust, pet dander, pollen, and other particles.
  • Active carbon filters: These filters help reduce odor by absorbing smoke, cooking smells, pet odors, and other irritants.
  • Washable Pre-filters: Avoid the cost and hassle of replacing your filter by choosing a washable filter that's easy to clean and reuse.

Initial Cost vs Annual Maintenance Costs

In many ways, a HEPA filter air purifier is a more advanced technology, but it does come with a cost.

  • Because HEPA air purifiers use a physical filter, it needs to be replaced on regular basis.
  • This can range from 4 or 6 months. Without a washable pre-filter, the HEPA filter collects contaminants, it gets dirty and clogged up.
  • The more pollutants it traps, the less efficient it is at cleaning the air.

This is exactly why Purafide designed their Two-Year Medical Grade H13 HEPA filters.

  • These extended life filters with save you over $500 in replacement filter cost in just the first six years.
  • Plus who wants to change a filter 17 times when they can do it only twice?

Air purifier features

  • Air Quality Sensor with Indicator: Some air purifiers have a built-in sensor that reads the air quality in the room. Normally, the unit will have a method of providing feedback based on the reading. Either a numeric display or changing color lights.
  • Filter replacement indicator: Most room air purifiers that use a HEPA filter, feature an indicator light that lets you know when it's time to replace.
  • Ionizing: Air purifiers with ionizing technology generate safe negative ions that attract positively charged air pollutants. As the charged particles clump together, they are easier to trap in the filters.
  • UV-C light: Part of the ultraviolet light spectrum, UV-C light is used by many hospitals to kill germs. UV technology helps destroy airborne contaminants such as bacteria, viruses, fungus, airbone mold, and mildew. It's often used in combination with a HEPA filter and activated carbon.

What Makes a Good Air Purifier?

Below is a list of the most common features of a good air purifier. Just choose the factors that are most important to you when selecting an air purifier for your home.

  • Pre-filter – This filter captures the largest particles (such as hair and dirt) and helps extend the life of the other internal filters. A pre-filter is usually washable, reusable, and attached to a HEPA filter. Good for the life of the HEPA filter.
  • Digital Controls – These allow more precise settings for air quality control than compared to a rotary dial or push button design.
  • Adjustable Fan Speeds – Air purifiers can have anywhere between 2-5 fan speed settings, ranging from low to high. Some even include a turbo speed to speed up the air cleaning process on demand.
  • Filter Replacement Indicators – These lights alert you to when it’s time to replace the filters. Keeping a fresh filter is the key to making sure that your machine cleans the air most effectively.
  • Programmable Timer – This automatically shuts off the device after a specific time interval, such as 2, 4, or 8 hours. This feature helps save energy and keeps the device from running continually when you’re away from home.
  • Carrying Handle – A handle gives you the option of easily transporting the machine between rooms without much hassle.
  • Air Quality Sensors– These sensors monitor the air for specific pollutants and if the unit has an ‘Auto’ fan speed mode it automatically adjust to the level it needs to quickly remove these particles.
  • Nightlight – Helps you easily locate the air purifier inside a dark room and is convenient for a bedroom location.

What are the Different Types of Air Purifiers?

In your research, you most likely have noticed that there are many different types, styles, and brands for sale.

This may seem overwhelming, however, there are really only four types of air filtration technology that these devices use.

HEPA Filtration: This is considered the gold standard.It consists of a highly dense paper filter that traps airborne contaminants and is the driving mechanism behind the top-end machines.

A True HEPA (H11 or H12) filter is certified to remove 99.97% of all microscopic particles as small as 0.3 microns in size. H13 and H14 HEPA filters remove 99.9% of particles as small as 0.1 microns.

Additional Info:

  • Pollutants it Can Remove: Pollen, airborne mold spores, fungi, dust, pet dander, hair, and visible smoke, higher-rated HEPA (H13 and above) can remove many viruses.
  • Advantages: Highly efficient, traps particles and doesn’t release them back into the air, safe for all respiratory problems.
  • Disadvantages: Requires routine filter replacements to maintain efficiency, usually the most expensive type of air filtration, uses a fan to pull in air and higher speeds can be noisy.

Ionizer Filtration: This air cleaning technology operates by emitting a cloud of charged ions into the air that latches onto airborne contaminants. This process forces these impurities to fall onto the floor and nearby surfaces.

Keep in mind there is always a chance the particles can be stirred back up into the air by ceiling fans, AC turns on, when people or pets walk through the room or touch a surface.

This can result in a constant cycle of impurities being removed from the air and then returning back to it because the particles are not technically removed from the room. This is one of the reasons why we don’t suggest ionizers for people with respiratory conditions like asthma (i.e. the particles are not collected).

Ionic air purifier: This type uses a fan to draw air into the unit. The air passes by a set of electrically charged plates. Electrostatic attraction occurs and the pollutants stick to the plates. When the metal plates become dirty, the particles can pass through the system because the electrically charged surface of the plates are covered by other pollutants. That’s why weekly/daily cleaning is necessary for maximum effectiveness.

Additionally, the process of electrically charging the metal plates can produce small levels of ozone as a by-product.

What you need to know here is that some people with respiratory conditions can experience lung irritation from ionic air purifiers.

So if you have health conditions like asthma, COPD, bronchitis, or emphysema, then you should choose a HEPA air filter purifier as these units produce zero side effects.

Carbon Filtration: This type of air filter uses a special form of activated carbon that consists of millions of tiny absorbent pores. These pieces of carbon have a large surface area that is excellent for trapping fumes, gases, and odors.

These filters are used for removing particles that cause odors and make a home smell fresh and clean.

Additional Info:

  • Pollutants it Can Remove: Odor and VOCs from chemicals, gas fumes, pets, cooking, smoke, paints, and cleaning supplies.
  • Advantages: Relatively cheap to replace, helps a room smell fresh.
  • Disadvantages: Focuses on removing fumes, VOC, odors and not allergens.

Ultra Violet (UV) Light: A UV light air purifier with this technology uses the UV-C band of the ultraviolet spectrum. This band is completely safe for humans and doesn’t cause any negative side effects.

The main purpose of UV light is to kill bacteria and viruses inside the home by destroying their molecular DNA structure. The end result is a sterilized, clean environment that’s free of particles that can make you sick.

Additional Info:

  • Pollutants it Can Remove: Bacteria, viruses, and germs are destroyed.
  • Advantages: Ultraviolet light lasts for thousands of hours, create a sterile environment, reduces the number of germs indoors that are responsible for creating illnesses.
  • Disadvantages:Only good at killing viruses, bacteria, and germs, cannot be bought as a stand-alone device.

Classic Version: Classic air purifiers are the traditional model for these machines and don’t give you feedback on what impurities they’re actually removing from the air. You just have to trust how well they’re working by seeing how dirty the filter gets and by the claims made by the manufacturer.

Smart Enabled Version: With a smart-enabled air purifier, you’re provided with a lot of additional information about your indoor environment and how effective the device is working. Some of these units come with a dedicated mobile app to provide remote control and other data. However, most people will not activate this app often.

CADR Stands for “Clean Air Delivery Rate”

This rating was developed as a way to help consumers know how well an air purifying device can clean the air within a particular size room. The goal of the CADR rating is to give you an objective standard to compare the effectiveness of a device.

This rating is especially important when you’re comparing two or more air purifiers against each other and trying to decide on which one to buy.

The CADR rating ensures that if a product claims to purify a space up to 300 sq. ft., it has been tested and verified to be true. It also tells you exactly how well the device can get rid of certain types of indoor contaminants.

The higher the number, the more effective the air purifier is at removing contaminants.