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Air Purifier FAQ

  1. How does an air purifier work?
  2. Do I need an air purifier?
  3. How much does it cost to run an air purifier?
  4. Why are some air purifiers more expensive than others?
  5. Are air purifiers noisy?
  6. How long should I run my air purifier?
  7. Where should I place my air purifier?
  8. What should I look for when choosing an air purifier?
  9. What is CADR?
  10. Will one air purifier clean my entire home?
  11. How often do I need to change the filter?
  12. How do I know when to change the air filter?
  13. What are the different types of filters?
  14. Do all air purifiers clean the same type of pollutants from the air?
  15. 14. Which air purifier is best for me?
  16. 15. What do I do with the dirty air filter after I change it?
  17. 16. Can you wash the filter?

1. How does an air purifier work?

An air purifier is basically a fan unit that draws air through a HEPA filter medium. The filter medium takes out tiny microscopic dust particles, particulate matter as small as 0.3 microns, odors and other toxic chemicals that are harmful to your health.

2. Do I need an air purifier?

Many people believe that their air conditioner cleans the air for them. Sadly, it does not. It cools the air and some units do filter dust and dirt, but without a proper HEPA filter medium, you are breathing the same air, just a little cooler and dryer.

If you suffer with allergies or asthma, you will find that having an air purifier will help to relieve many of your symptoms.

The air pollution problem in Taiwan has become much worse in recent years. We spend more than 80% of our day indoors, either at home, work or school. 

Very simply, if you are not using an air purifier or some kind of indoor air filtration in say, a central air conditioning system, then the air quality indoors is the same as outside. Sometimes it is worse when you consider cooking, aerosols, cigarette smoke etc. 

3. How much does it cost to run an air purifier?

Many people confuse an air purifier with an air conditioner and therefore they believe they are expensive to operate. Some air purifiers are much more energy efficient than others. HEPA air purifiers typically consume 50 to 200 watts of electricity. To put this into perspective, a lamp uses approximately 60 watts and a computer uses 365 watts. Using an air purifier probably isn't going to affect your electricity bill very much. 

The main thing to consider in an air purifier is the cost of the replacement filter medium. Filters usually need to be changed 2 to 4 times per year depending on the air quality and can cost anything from a few hundred NT Dollars to several thousand.

4. Why are some air purifiers more expensive than others?

Several factors influence the price of an air purifier. An air purifier increases in cost due to:

  • Build quality
  • The size of space which they are able to clean
  • How much noise it makes

5. Are air purifiers noisy?

Air purifiers usually have a few different speed settings, typically low, medium and high. When the purifier is set to a low fan speed you will hardly notice any sound unless you stand right next to the machine. As you increase the speed setting, the unit will begin to make more noise. Many purifiers also have a “sleep” or “night” mode setting which allows for ultr-quiet operation during the night so that you are not disturbed while sleeping. During this setting, the fan usually spins at a very low speed, but still provides effective filtration in your bedroom.

6. How long should I run my air purifier?

For best results, it is recommended to continuously run your air purifier. To help with noise and electricity costs, most air purifiers come with multiple cleaning speeds. For example, to maintain your indoor air quality while you are away from home, your air purifier can be on a lower setting than when you are home. This saves energy and cuts costs while still maintaining a clean environment.

7. Where should I place my air purifier?

Most air purifiers are designed to clean single rooms, so naturally, it's best to place an air purifier in the room you spend the majority of your time in. For most people, this place is the bedroom. However, you may also spend a bulk of your hours in a home office or a living area with your family. Moreover, children may make frequent use of a dedicated play area. It's beneficial to create clean air in these environments as well.

8. What should I look for when choosing an air purifier?

You should purchase a unit that is within your budget, but is also suitable for the size of the room/space which you are purifying. If you buy a very small unit and try to clean a large area of say 20 ping, the purifier will not be very effective at all and you will need to purchase additional units to ensure proper filtration of the space.

All air purifiers will state what size of room they are able to clean. In Taiwan it will state the number of ping or square meters that the air purifier is suitable for.

9. What is CADR?

You may often see CADR written on the box somewhere. CADR stands for Clean Air Delivery Rate and refers to the volume of filtered air that the purifier can deliver in one hour. It is given in three measurements - one for pollen, one for tobacco smoke, and one for dust. The higher the CADR number, the faster the unit filters the air.

Note that the CADR rating is measured by turning the air purifier to its maximum setting. So the CADR number relates to how much filtered air can be delivered at the purifier’s maximum setting. 

10. Will one air purifier clean my entire home?

This really depends on the size of your home. In Taiwan, many people live in apartment buildings. If you have an air purifier that can handle a space the size of your home, you can probably leave all of the doors open in your home and place the air purifier in the living room. However, we suggest that at night when you are sleeping you should either move the air purifier into your bedroom while sleeping or consider purchasing extra smaller purifiers for each bedroom. If you close the door and the air purifier is outside of your bedroom it will have little to no effect. 

You can consider purchasing a Laser Egg which will help you to understand how effective your air purifier is at cleaning your home. This way you will know for certain whether one air purifier or multiple air purifiers are required. You’ll also be able to know when you should switch to a higher fan speed setting during heavily polluted times.

11. How often do I need to change the filter?

Check the manufacturer’s recommendations. Filters often need changing 2 to 4 times per year depending on the conditions in your home and how bad the air pollution is outside. Many units will signal when the filter needs to be replaced, usually with an LED indicator light.

12. How do I know when to change the air filter?

Many units will signal when the filter needs to be replaced, usually with an LED indicator light.

Also, by using a Laser Egg, you can know whether the air filter needs to be replaced early or it can be left in the purifier for a longer period of time than what is recommended by the manufacturer. We do recommend that you change air filters regularly to ensure that you are getting the maximum protection possible.

13. What are the different types of filters?

There are three types of air filters:

HEPA Filters: 

High Efficiency Particulate Air (HEPA) filters remove 99.97% of particles that are 0.3 microns and larger from the air. This makes HEPA filters ideal for removing small pet dander particles, dust mite residue, and pollen from your air.

Carbon Filters:

Using activated carbon, these filters remove odors and chemicals from your indoor air. These odors and chemicals include cigarette smoke, fumes, formaldehyde, volatile organic compounds (paint fumes, glues, new building materials, etc.), pet odors, and kitchen odors.

Pre-Filters: 

These filters are a great benefit because they help extend the time between filter cleanings or changes as well as maintain the air purifier's functionality and efficiency. Pre-filters do this by trapping large particles before they reach the main filters of the air purifier.

14. Do all air purifiers clean the same type of pollutants from the air?

People use air purifiers for a wide range of reasons, from basic air cleaning to high volume allergen removal for allergy- and asthma-sufferers. There are air purifiers that remove smoke, pet dander, pollen, and even chemicals. For the most thorough particle filtration results, look for air purifiers with true HEPA filters. If you want to address odors and chemicals, look for models with carbon filters. To combat airborne germs, newer models are now being equipped with internal ultraviolet lights, in addition to traditional filters.

15. Which air purifier is best for me?

This depends on multiple factors including the condition you want to treat, square footage, CADR rating, frequency of filter replacements, type of controls, and much more. Ultimately this choice is a personal one, which is why we supply you with the best information to make an informed decision when choosing an air purifier.

16. What do I do with the dirty air filter after I change it?

Proper disposal of the old filter is essential to prevent all the collected debris from becoming airborne once again. Remember that an old filter has 30 to 90 days of trapped material in it, so many irritants, allergens and other particles can easily become airborne again.

To properly dispose of a used air filter:

  • Have a plastic bag on hand and turn off the unit before you begin. 
  • Start by carefully removing the used air filter from the HVAC unit and placing it gently into the bag without shaking to prevent it from releasing the dust and particles into the air. 
  • Tie or tape the bag shut immediately. 
  • Carry the plastic bag with the furnace filter immediately to your outside trash can and put it inside.

17. Can you wash the filter?

No, you cannot wash the filter. It is not possible to wash out the dirt that has been trapped inside the filter. 

Once a week you may use a vacuum cleaner to remove any regular household dust that has built up on the outside surface of the air filter. This will help to extend the life and effectiveness of the filter. Be careful not to damage the filter by poking or piercing it with the vacuum attachments.

18. Still got questions?

If you haven’t found what you’re looking for in our FAQ section, then please contact us and we’ll do our best to assist you.