Of course, the higher the number of changes the better! The number of changes usually varies anywhere between 1 and 7 (7 being the most efficient). Put simply, ACH shows you how many times the entire volume of air inside a room is replaced during the course of one hour. For the most part, air flow is dependent on two factors: the power of the fan built into the air purifier, and the efficiency of the filter that’s inside. Just so you know, purifier air flow is abbreviated to CFM or cubic feet per minute. However, volume is what I’m interested in and so are the manufacturers that produce air cleaners. Since air is a gas, it can be measured either by its volume or its mass. The air flow rate shows how much air passes through the purifier over a certain time period. I’m going to deal with the first two here, because the CADR rating deserved its own page). Now, the three most important factors that play a role in the performance of an air purifier are the air flow rate, the number of air changes per hour and the unit’s CADR rating. As you’re in the market for portable air cleaners, these won’t help you much, so I decided to compile a short guide here. Sadly, most of those articles are about the efficiency and the performance of central HVAC units. There is a lot of information about the performance of air purifiers on the web. How to Determine the Performance of an Air Purifier That’s why I’ve decided to shed some light on things you should look for before shelling out your hard earned cash on a pricy piece of air purifying equipment. The one thing that makes all of the categories of people mentioned is the actual real-life performance of the purifier. There is a third group of people, namely pet owners who have a lot to gain from buying an air purifier. On the other hand, those dealing with asthma and allergies will want to pay more attention to pollen and dust mite filtering capabilities. An air purifier which is effective at collecting dust is perfect for people living in large cities or areas where there are plenty of these particles hanging around. I’m going to talk about the parameters you should consider before deciding on which air purifier to purchase for your home.
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