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How Long Does an Air Purifier Need to Clean a Room?

by Abhay Choubey

Have you heard the saying goes, “A woman’s work is never done?” Your air purifier is never finished either. There are six basic reasons why you need to continually purify your air. Understanding them all allows you to get the results you want with clean air.

Every now and then is never enough

The most common misconception about air purification is to believe that it is a single task that, once done, is done until another day. Air purification is not like vacuuming the floor, washing dishes or clothes. Using an air purifier for a few hours does not end the work of air cleaning.

The reason is simple. The room air is subject to constant change. Pedestrian traffic, coughing and sneezing, normal peeling of the skin (dandruff) on people and pets, your central heating and ventilation system, and other activities are constantly bringing in particles, gases, and microorganisms.

Six facts about healthy air

Most likely, you want certain health benefits like allergy or asthma relief. What do you need to know to make sure your air purifier is delivering these health benefits? Consider the following six problems:

Your personal sensitivity
Dilution of pollutants
Spread of pollutants
Reintroduction of pollutants
Air changes per hour (ACH)
Efficiency of your air purifier

How do these points relate to your air purification efforts?

Everyone has their own “tipping point” Medical Air Purifier. Personal health and environmental factors make this a moving target. Certain allergens can cause a reaction today, but not tomorrow. It depends on your overall exposure to irritants and physical stress.

The goal of air purification is to gradually dilute pollutants with clean air and keep them below the threshold at which they react.

Why am I talking about a dilution of the pollutants and not a complete elimination? Because particles and gases do not stand still for an air purifier to catch them individually. Normal particle movement distributes them evenly in your room air.

This means that clean air leaking from your air purifier will almost immediately be contaminated again by the untreated air. You can’t keep clean air on one side of the room while you clean the air on the other side.
For this reason, your air purifier should run continuously. Constant treatment reduces pollutants and keeps them at a low level.

Air purification is counteracted by the reintroduction of new pollutants. Reintroduction is like a leak in a boat. Over time the boat sinks. Your air quality will also decrease if you fail to meet the reintroduction rate for new pollutants.

Just as the boat needs constant pumping to stay afloat, your indoor air needs constant cleaning to stay healthy.
This is where ACH or air changes per hour comes into play. ACH indicates how quickly you can rid your indoor air of pollutants.

ACH is determined by dividing the cubic meters of purified air your Medical Grade Air Purifier can deliver in an hour by the cubic meters of the room. Say your room is 12 x 15 with a 2.50 m high ceiling. That’s 1440 cubic feet (12 x 15 x 8). For example, let’s say your air purifier delivers up to 165 cubic feet per minute (165 CFM) or 9900 cubic feet over an hour. If you divide 9900 by 1440, your air purifier can do 6.8 air changes per hour in that room.

This air purifier would be an excellent choice for this room. Most experts agree that 6 ACH is needed for people with severe respiratory problems. A minimum of 4 ACH is recommended for the relief of typical allergies. In any case, never less than 2 ACH for any benefit and then only with the most efficient air purifier.

Which brings us to the topic of efficiency. Not all of the air that passes through an air purifier can be cleaned. Some can bypass the filter or the machine simply cannot remove 100% of the particles that pass through.

The lower the overall efficiency of the system, the more often the air has to flow through the air purifier in order to achieve the same cleaning result as with a device with higher efficiency. Therefore, I recommend using only air purifiers with proven high system efficiency. It does the job effectively with less ACH, which means lower fan speeds and less noise.

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