Despite the universal, and often false, "quiet" claim by air purifier manufacturers, "Noisy on the high speed" is by far the most frequent consumer complaint.

The real issue is not how loud a purifier is on high, but how much sound it makes while cleaning meaningful amounts of air.
Several premium air purifiers are loud on high, but offer as many
as six speeds for useful quiet air purification.

The Decibel (dB) scale measures noise in objective terms.

On the Decibel scale, each 10 points [dB(A)] added represents 10
times as much sound. For example; 70 dB(A), is not 17% louder,
but ten times as loud as 60 dB(A). With many purifiers topping out in the low 70's, louder than normal conversation, sound levels are a major consumer concern.

A few Decibel ratings;

Threshold of human hearing: 0 dB(A)

Quietest air purifier: 15 dB(A)

Soft whisper: 20 dB(A)

Good air purifier on low: 32 dB(A)

Ordinary air purifier on low: 36 dB(A)

Refrigerator: 50 dB(A)

Normal conversation: 60 dB(A)

Dishwasher running: 55-70 dB(A)

Typical air purifier on high: 66 dB(A)

Busy street traffic, loud air purifier: 70 dB(A )

Car interior: 75 dB(A)

Vacuum cleaner: 80 dB(A)

Common home stereo: 80 dB(A)

Lawn mower: 90 dB(A)

Rock concert: 110 dB(A)

The air purifier industry has no standards for noise levels. Only a few vendors voluntarily reveal actual decibel sound emissions.

Many people will find equally noisy machines are not equally distracting. This is because the combination of sounds is different, more harmonious.

The notion that a quieter air purifier produces less stress and improved health is confirmed by scientific studies. Prolonged exposure to noise levels above 70 dBA can cause hearing loss. Noise levels greater than 50 dB(A) can make quiet conversation impossible.

Most air purifiers have a fan to move air. Nobody has found a way to clean air without moving it. Moving air makes noise.

We are told to make a purchase based on the largest room size an air purifier can clean. Manufacturer's room size recommendations are based on full time high speed operation. This is not acceptable to most users, who will turn the purifier down or off.


https://airshaft.co.in/