Your Guide to Air Purifiers.

Sometimes, it’s just not possible to open up the windows to let contaminated air out of the home.  That’s when an air purifier becomes your virtual ‘open window’. But, choosing the right air purifier can be challenging. With so many different types, in various sizes and with varying levels of performance, there’s the risk that you could spend hour after hour researching. 

That’s why we put together this guide, along with our product reviews, to provide you with an independent helping hand. 

Filter or No Filter?

Nearly all air purifiers are equipped with a HEPA filter. A HEPA filter captures over 99.9% of particles in the air and can trap particles as small as 0.3 micrometers. This is not only useful for catching mold spores in an affected area but also helpful for sufferers of any allergy caused by dust or pollen.


Some air purifiers on the market contain more than one filter. A second or third filter containing carbon sits ahead of, or behind the HEPA filter, and can be tailored specifically to particular uses such as pet odor, or cigarette smoke. So again, this type of system may be something to consider if you are looking for a solution to these types of problems.


Other air purifiers have no filters at all, but use a method called Ionization. Ionizing air purifiers work by attempting to attach an electrical charge to spores, dust and allergen particles that pass through the unit. These neutralized particles then stick to surfaces nearby.


There are, however, several disadvantages to using an Ionizing unit: Ionizers usually don’t contain a fan, which means the device will only work effectively in the area around where it’s been placed. Ionizers can also produce ozone, which is harmful to the environment.

How Much Power?

In addition to the filtration system within an air purifier, the amount of power the unit has also needs to be considered. So, what kind of space do you want to use the device in?

Size, in this case, knowing the size of the room you want to use the air purifier in, really matters. Let’s say you purchase a unit capable of purifying the air in a room of 20 sq./m, but your living room is actually 40 sq/m. Well, you don’t need me to tell you that this won’t be sufficient for your needs and you won’t get the results that you’re looking for. So spending some time measuring the room will ensure that you get the right tool for the job.

Room dimensions


Ordered a super-high-powered-turbo-vortex-jet-fan unit for your damp-suffering bedroom? Enjoy those sleepless nights because the noise is likely to be high, leading to sleepless nights and unnecessary power usage.

It can be a minefield choosing the right air purifier for your home. But as long as you consider where you want to use it, and how large that space is, then you should be off to a great start in choosing the right machine for you.

Clean Air Delivery Rate (CADR)

CADR measures the cleaning speed of the purifier for removing smoke, dust, and and pollen. Look for a CADR of at least 300, above 350 is really great. There are some criticisms of using the clean air delivery rates as a way of measuring the effectiveness of an air purifier. That’s because it doesn’t take into account the quality of the filtration.

You also need to consider that the CADR is only measured on three pollutants, dust, pollen and tobacco smoke. So, if you were looking for an air purifier to cope with pet allergens, then you need to take into account that a machine which only provides a CADR hasn’t been tested on the problem that you’re looking to resolve. 

Air Change per Hour Rating (ACH)

ACH stands for Air Changes per Hour. This rating provides information for you on how many times per hour an air purifier device can exchange the air within a room. So, the more often that there’s a complete fresh air exchange the better the air quality will be.


Air Purifier Disadvantages

Well, the result of owning an air purifier is cleaner air in your home, the elimination of mold, and the general reduction of allergens. So, are there any real disadvantages to owning one?

Basically, no.

The long term goal when purchasing an air purifier is removing particles in the air around your home that can cause mold and other problems, making it cleaner and safer to breathe.  Following our instructions will help you to choose the correct device for your requirements.