Conventional HEPA filter
Xiaomi's High-Efficiency Filter
![Xiaomi Smart Air Purifier 4 Filter]()
Less clean air
![Xiaomi Smart Air Purifier 4 Filter]()
More clean air
The HEPA filter is made of dense fibreglass to trap particles, which means that less clean air gets through the filter.
Xiaomi's filter uses melt-blown PP fibres with electrostatic technology. With greater space between fibres, larger volumes of air are able to pass through the filter.
![Xiaomi Smart Air Purifier 4 Filter]()
Noisy
![Xiaomi Smart Air Purifier 4 Filter]()
Low noise
Large volumes of air are forced through the dense HEPA filter, meaning a higher fan speed is required, which generates more noise.
With a lower fibre density, the filter allows air to pass through at high speeds, resulting in less noise.
![Xiaomi Smart Air Purifier 4 Filter]()
Higher energy consumption
![Xiaomi Smart Air Purifier 4 Filter]()
Lower energy consumption
In order for the HEPA filter to release more clean air, the motor must run at a higher speed, which translates into a higher energy consumption.
With a lower fibre density, Xiaomi's filter is able to release the same volume of clean air as a conventional filter, but with a much lower energy consumption.