Questions about Air Quality

Why should I care about my indoor air quality?

When we normally think about air quality, it is normally outdoor pollution that comes to mind. Having clean air to breathe seems more like a generalized environmental concern. As long as we avoid excessive amounts of smoke and have the inner sanctums of our homes to take refuge, most people likely view air quality as an issue that applies to the outdoors. Unfortunately, that is not the case. With an abundance of indoor air pollutants that can plague our health, education is key. Furthermore in Hong Kong there are many outdoor pollutants that find their ways into your home and manifest in this way. The use of air conditioning worsens the effects of these pollutants. Breathing clean air is not only important if you have allergies or asthma, but for the general health and the state of your lungs it is vital.

How does something as essential and seemingly free-flowing as air become such a prevalent hazard in our homes?

One major factor that contributes to indoor air pollution is a lack of adequate ventilation. First and foremost, homes are built to be energy efficient, and that means sealing it up tight so ambient energy doesn't escape and hike up your utility bills. However, what is good for your finances is actually working against you when it comes to your lung and heart health.

What is "little dust"?

The truth is that even though these various imperceptible particles are undetectable to the human eye and other senses, your lungs and heart are in jeopardy. Airborne particles (also known as Particulate Matter) are a mixture of microscopic solids and liquid droplets suspended in the air. Made up of a variety of particle pollution elements, this mixture can include dust, chemical fumes, gases, smoke and biological contaminants such as skin flakes, mold, dust mite and roach excrement, pollen, animal dander and various other sources. When inhaled, they pose a serious danger relating to the development or worsening of lung disease and can compromise your cardiovascular health. Allergy and asthma sufferers are particularly at risk, as well children and the elderly.

How does my indoor air quality relate to the local outdoor air quality in my area?

We tend to think we are safe from the dangers of air pollution when in the sanctity of our own homes. However, this is not the case. While indoor air is, on average, 2 to 5x more polluted than outdoor air, the two are still related. Outdoor air does travel inside at certain times, and local allergens as well as auto emissions or smog will also make their way into your home and become trapped. Increasing ventilation and air circulation with clean purified air is recommended by the EPA.

What is Clean Air Delivery Rate (CADR)?

Clean Air Delivery Rate (CADR) is a figure that measures the cubic feet per minute of air that has had all the particles of a given size distribution removed. For air filters that have air flowing through them, it is the fraction of particles that have been removed from the air times the air flow rate through the device. The higher the number, the better the filter is able at filtering out the particles.

What is HEPA?

HEPA stands for High Efficiency Particulate Air, and is a type of filter that traps the most significant amount of allergens and pollutants from the air. Air purifiers with a HEPA filter are the most effective, and all units sold on airpurifiershop.hk are sold with a HEPA filter. More information on HEPA and other filter technologies can be found on our Buying Advice.


Questions about Air Purifiers 

What should I consider when choosing an air purifier?

To find the best air purifier for you, consider what kind of solution you are seeking, as well as which air purifier technologies may work best for your needs. Read to learn more about what you should keep in mind before purchasing an air purifier.

  • FeaturesWhen researching which air purifier to purchase, consider if you would like an air purifier with a shut-off timer or other features, such as technology that sensors air pollutants in the air, a filter life indicator, or a UV light.

  • EffectivenessAir purifier effectiveness varies from model to model, removing different amounts of airborne particles from your air. For example, a lower-end air purifier may remove only 30% of particles, whereas higher quality units can remove up to 99.97% of particles. Always consider square footage in conjunction with effectiveness to measure performance.

  • Square FootageThe placement of your air purifier will make a difference in its effectiveness. Before you purchase, decide where you will place your unit and make sure the square footage of the space can be covered by the air purifier.

  • StyleWhile the function of your air purifier is paramount, you may want to consider whether the style of the air purifier is important to you. In other words, think about how the air purifier fits in with your home’s decor.

  • Price PointWe believe that air purifier technology is an investment in your health. Many air purifier brands claim significant results at lower price points. In our experience, the unit quality and performance suffer at lower price points. However, we recommend investing in the best air purifier you can get within your budget.

  • WarrantyAir purifier warranties are beneficial, especially if you plan to use your unit long-term and encounter issues after several years of ownership. When it comes to air purifiers, a good rule to remember is this: the shorter the warranty, the shorter the lifespan of your air purifier.

 Which room should I use my air purifier in?

If you only own one air purifier, the ideal place to put the unit is in your bedroom. This is the room in your home where you spend the most time out of each day. An air purifier in the bedroom can contribute to a better night's sleep by reducing allergy symptoms that make a good night's sleep difficult. In addition, the white and pink noise produced by an air purifier can help you sleep more soundly.

Where should I place my air purifier?

For all air purifiers, you will want to be sure to not block the air entrance and exit vents. Ideally, try to keep your unit at least 1 foot away from walls, and furniture. This will allow air to circulate properly around the room and into the air purifier. For Tower units, directing the air out into the room is best. Do not direct the clean air at a wall or furniture or this can interrupt the airflow in the room. For box units that direct air upwards, do not place them under a table, or a shelf, which can block the airflow. Allowing the airflow to blow to the ceiling is best, as it will circulate along the ceiling and around the room, bringing dirty air back towards the unit.

When should I run my air purifier?

We recommend that you run your air purifier 24 hours a day. However, if this is not practical for your situation there are proper ways to use your air purifier to maximize its performance.

Why should I run it 24/7?

An air purifier is only functioning when it is being operated. As soon as the air in a room is no longer being filtered, the air can return to normal (dirty) levels within hours. By constantly using the air purifier, the air is being filtered at a non stop rate. If the purifier has been turned off for several hours, it is recommended to turn it on at the highest level for 1 to 2 hours (depending on the size of the room).

What speed should I run it on?

The speed you use should correspond to the room size that you have placed the unit in. If you get a unit rated up to 750 square feet, this means 750 square feet of coverage on the highest speed. Using it on a lower speed will take longer to clean the room. Most units will be too noisy to run at the highest speeds for 24 hours a day. Realistically speaking, if the units is turned on for 24 hours, it can be run at lower speeds.

How often should I replace my filter?

The replacement of your filter is dependent on many factors. Different models have different life cycles. Furthermore it varies based on pollution levels and how often you use it at which speed. All manufacturer's give indications for replacement times. Please visit the product pages for more information about filter replacement. If you have bought your air purifier with us, we will automatically send you a reminder when your filter is due for replacement.