Air Purifier FAQ: 25 Top Frequently Asked Questions

There is no doubt that an air purifier is one of the appliances that every home needs. In that case, there are many frequently asked questions.

Here, we have anticipated several of these questions and answered them for you.

If you live in a place whose air is contaminated with dust, unpleasant smells, smoke, viruses and fungi, mold spores, and others, you need an air purifier.

If you have a humidifier and a dehumidifier, they will not remove pollution from your indoor air. You still need an air purifier.

If you have someone in your family who suffers from asthma, respiratory illnesses, and other similar conditions, inhaling pure air at the right humidity helps. In this regard, we believe that everyone should have an air purifier, even if it is a small, portable desktop one.

Frequently Asked Questions for Air Purifiers

Here are some of your questions: If you have any that you feel we have left out here, you can add it in the comments section.

1. What is an air purifier?

It is an electric device for purifying air in enclosed spaces to make it safe for human consumption. It removes airborne allergens and pollutants by pulling the air in, cleansing it, and releasing it back to the room.

2. How does an air purifier work?

An air purifier has filters and a fan. It draws air through the air intake vent in the front and passes it over the air filters to cleanse it. It then releases the cleansed air back into the room.

3. Where should I place my air purifier?

It is better if the air purifier is at least 6 feet away from you. At the same time, it should not be further than 10 feet from your desk or bed, because then it might not be very effective. In the bedroom, place the purifier within a range of 6 to 10 feet. Also, don’t place it too close to indoor plants.

4. Where should you position an air purifier?

It should be at least 3 feet from the ground so that it can catch the floating allergens. When the air gets hot, it rises, and so do the pollutants that you want to remove. Therefore, if you place it on the floor, most of the pollutants will escape.

If you know the source of the pollution, place the air purifier right there so that it can prevent the polluted air from spreading to other rooms.

5. Where should I place my Dyson air purifier?

The best position to place any air purifier is at least 20 inches from the wall or furniture so that it can pull in air from all directions. Do not keep it too close to the baby’s bed or your bed since it could make you experience sore throats, headaches, and dry skin.

6. Can I put my air purifier on a table?

It is recommended that you put your air purifier on the table. That way, it will be able to capture floating pollutants such as mold spores, dust, dust mites, and others. An air purifier should be elevated by about three feet.

7. Should I sleep with an air purifier on?

As long as you keep the air purifier within the recommended range of 6 to 10 feet, the purifier should be just fine, and in fact, it can help you breathe better.

When you sleep, your body still needs clean oxygen to perform certain functions, such as metabolism. Therefore, if you have polluted air in your home, keep the air purifier on through the night.

8. When should I use an air purifier?

Crank your air purifier if you have stale air from the basement. If there is some remodeling work going on in your house, an air purifier can help to remove the dust and other particles.

It can also remove the unpleasant smells from remodeling products. If you have pets, pollen, and other allergens, use an air purifier. Finally, you can also use it in the kitchen to remove any burned food smells and smoke.

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9. What is a HEPA air purifier?

This one comes with HEPA filters that are washable, replaceable, or both. When the air purifier draws the air in through the intake, the filters capture the allergens and then the fans blow the clean air out.

10. What is an activated carbon air purifier?

This air purifier uses activated carbon to remove odors from your air. It is not everyone’s favorite because some people say that it releases carbon monoxide, albeit in very low levels.

The benefits of activated carbon filters are many. For instance, it can remove odors from used baby diapers, burned food, and many more.

11. Do air purifiers make noise?

If it has a fan, it will make noise, no matter what the marketers tell you. There is air movement, so there is noise. However, on most models, you can adjust the noise level so that you can sleep.

12. Which room should I place the air purifier?

You should keep the air purifier in the room that you use most, since that is where you need clean air most. The good thing is that in the daytime, you can place it in the living room, and at night, place it in the bedroom so that it can help you get a full night’s sleep.

13. Can I move my air purifier from room to room?

Portable ideas are not only easy to move from room to room, but they are also safe to handle. Modern air cleaners come in manageable sizes to help you get clean air in the rooms where you need it most. Since they are just plug-and-play in design, using them is so easy.

14. Should an air purifier be placed on the floor?

Never. It will not have an effective floor-to-ceiling reach when you place it on the floor. Therefore, you should install it on the wall, or you can place it on a desk or a table. Besides, if you have pets and small kids, an air purifier can be a tripping hazard since it is mostly corded.

15. Should you run an air purifier all the time?

This depends on the type of air purifier. For instance, the HEPA air purifiers pose no hazard at all. However, ozone purifiers can generate ozone gases, which would not be good for your health. Therefore, it is recommended that you run when there is no one at home.

16. Does an air purifier have any health benefits?

Indoor allergens such as dust mites, pet dander, dust, pollen, smoke, mold, and mildew can provoke allergies. An air purifier can get rid of all of these. Air purifiers will get rid of stale air in the house and replace it with purified, clean air. These appliances can also remove the burned smell from your kitchen and remove even pet smells.

17. Do air purifiers actually work?

Air purifiers will remove indoor air pollutants such as mold, smoke, dust, pet dander, dust mites, and others. It can help purify the indoor air, but it will work better when you have a good cleaning regimen. If you live in a place with polluted air, you cannot survive without this appliance.

18. What Is CADR In Air Purifiers?

The CADR of an air purifier should be 2 times the speed of the fan. For example, if your air purifier fan has an output of 120 watts, the CADR should be 240.

CADR means the rate of removing pollutants such as smoke, pollen, and dust from the air. This just means the clean air delivery rate in a purifier. It is an indication of how efficient an air purifier is at removing pollutants from your indoor air. The higher the CADR is the better.

19. What is ACH in air purifiers?

This means the Air Change per Hour. For instance, if your air purifier has an ACH rating of 3, it means that it can clean the air in the room (for the space it is rated for) three times every hour.

20. Do air purifiers have space ratings?

This is the ACH – Air Change per Hour rating. In addition, you should check the area of your room in square footage. For instance, if your room is 10 by 20 feet, the footage is 200 square feet. In this case, we assume you have a standard ceiling height of 8 feet. Therefore, you should get a purifier that has a rating of more than 200 square feet.

21. Do you need an air purifier in every room?

You can move one air purifier from room to room if need be. The best place to place an air purifier is at the source of the pollution. Once you arrest the contamination at the source, it will not spread to the rest of the house.

22. How long does it take an air purifier to clean a room?

This depends on the CADR and ACH rating of the air purifier. The higher the ratings, the faster it will take to purify air in a room. For instance, if you use a purifier rated for 400 square feet in a space of 250 square feet, it will do a faster job, and you might only have to run it for a couple of hours.

23. Should I leave my air purifier on when I’m not home?

It is perfectly fine to leave your air purifier on when you are not at home. That way, it can continue purifying the air and when you come back, you will be welcomed by fresh air.

24. Does smart mode in air purifiers help?

If a purifier has a smart mode, it has a small monitor for air contaminants inside. Therefore, when it reads excess levels of contaminants, it turns itself on automatically. When it reads a low level of contaminants, it turns itself off automatically.

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Polluted air in China

25. How do you know if an air purifier is working?

An air purifier moves air in and out. It draws air in through the intake on the front using fans. It then releases purified air through its vents. Therefore, if you place your hand close to the vents, you should feel air coming out. That is how you will know that the air purifier is working.


That is it about the air purifier FAQ, with most of the things that you would like to know about these appliances.

We hope our list of air purifiers frequently asked questions has helped you to know enough information about these appliances. Now, you can order a HEPA filter from

The Honeywell True HEPA Allergen Remover Air Purifier is one of the top-rated air purifiers that you can buy for your home. It comes with true HEPA filters.