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I might as well be a primary teacher, I've had enough practice lately so, if you didn't learn basic math and an understanding on horsepower, I will try to explain it with basic terms.

1 horsepower = 746 watts.

If a motor is 2 hp, shouldn't it be 1492 watts?

So, if they say they have a 1 hp motor, the next question should be, how many watts.

You can lie about hp ratings after gear reduction but not wattage. You can't fake or lie about that. On some motors that are less than 746 watts, you can get an output of more than 1 hp after gear reduction but it is better to have the wattage of real input horsepower before considering gear reduction. The gear reduction of a Mercedes is better than a Honda even if they have the same horsepower. Two different cars brands can have the same horsepower but one takes more fuel than other.

Also, if you get a 1000 watt purifier and they say it is 1 HP, ask yourself if it is constant or is it peak horsepower. It is a very confusing topic, I know.

SCAM - Some companies advertise online that they have powerful motors and that is why they cost more.

After researching, I found that there are many ways of claiming power. IS IT PEAK POWER, CONSTANT POWER, INPUT POWER, OR OUTPUT POWER. A 1 HP motor can be rated at 1 HP with no fan on it and no filters. I have 3 words for you. "CHEAP INDUSTRIAL MOTORS". Do you want to buy some cheap motor and pretend it is a quality motor that you can keep on all day long for years? You need to read the application for the air purifiers. Some motors are made to last and others just outside of the warranty period. It is so funny.

If you don't care and are reading this, you can pretend you have a quality motor until it burns out. You can even start selling them and start your own business and come up with your own brand! PLEASE DON'T.

I strongly advise people to NEVER buy if they don't include the amperage rating along with the horsepower TOGETHER. Some machines need too many amps and require too much electricity to do the same job as a brand using lower amperage. If you can afford to waste electricity then it doesn't matter to you but it is using resources. Please keep it green.

Some motors have more mass than others and work on momentum. Smaller motors seem to create more EMF as they can rely on more amperage. Motor force from heavier motors is always different but more costly up front. A larger motor working on lower settings using this momentum can have lower noise too.

More info on choosing a quality motor since you can't see them online

It is really cheap (and profitable) to build leaky air purifiers with cheaply lubricated windings. Usually the poorly designed motors are noisy and have poor quality fans. Their fans are usually not fans with backwards curves and even the motors ball bearings are not sealed and make the motor more noisy.

Poorly designed motors also make noise when their windings and brushings wear out. Noise develops often when the fan shaft is not stable over time as it wears down which gives it wiggle room. This just adds to the noise. When wiggle room develops there will be more vibration as it progresses. Some are so bad that the fan gets off center and the edge of the fan rubs the frame.

The heavier the air purifier the better it is as it has more mass so it doesn't vibrate as much over time. Plus, the purifiers that are heavier absorb more of the sound too. Many people don't like purifiers that are too heavy so they can't market them as being easy to move around. If it is too flimsy it will make too much noise so you need to weigh out the two. Do you want something durable and heavy or something that is easy to move around. Lighter models that are engineered well will be more expensive but you can get away with a lighter model that doesn't have the problems as the very light ones that are cheaply made

Depending on your the volume of air you want to circulate at one time and the size of the room you will get different recommendations from me. I will help you pick out the brand and right size motor you need based on the answers on your quiz. Take the air purifier quiz here.

What I don't like about cheap air purifier motors:

1. Most motors require some type of lubrication and sealants to lubricate the components of the motor. When the motors get hot, especially when run on high speed, sometimes the petroleum and other vapors can off-gas. Better designed motors have less of this leached smell.

2. Some motors are louder than others. Usually the AC motors are the loudest and are the cheapest to produce. DC motors usually have less noise and use less energy. The EMF from DC motors is almost zero while AC motors release more EMF the faster the motor goes. Most purifiers on the market use AC motors.

I always look for brushless DC (not AC) motors. Brushless is uch more quiet than the older early generation brushed motors. The dc motors also have less EMF emmissions also.

see my EMFpage here

Since noise is the biggest complaint along with getting a purifier that is 100% sealed with no leaks, the fan also has to be high quality. The angle, pitch of the blade if more curved has to spin less and the flater the curve the faster the fan spins but pushes less air. The purifiers with better ball bearings are generally less noisy. They must be the sealed type or it can be loud. The cheap air purifiers with the cheap motors usually have cheap bushings also. They oxiidize and the fan gets loose makig it slightly wobbly making noise usually not during the warranty period but it can happen later. Not soon enough for you to want to return teh air purifier right away. I have seen some fan that the tips are worn down cuz the started rubbing the frame. You never hear the noise after it wears down but the efficiency goes down and the purifier can start vibrating. But then again, this usually doesn't happen until later on.