Conventional HEPA filter
Xiaomi's High Efficiency Filter
![Xiaomi Smart Air Purifier 4](https://cdn.statically.io/img/i02.appmifile.com/645_operator_sg/15/10/2021/8959b605fe8e40b131e1185973a28e91.png)
Less clean air
![Xiaomi Smart Air Purifier 4](https://cdn.statically.io/img/i02.appmifile.com/569_operator_sg/26/10/2021/524e014d9ea2421065917140ebd5d684.png)
More clean air
HEPA filter is made of dense fiberglass to trap particles, which means that less clean air get through the filter.
Xiaomi's filter integrated melt-blown PP fibers with electrostatics technology equipped with bigger fibers space, which enables a large volume clean air to get through the filter.
![Xiaomi Smart Air Purifier 4](https://cdn.statically.io/img/i02.appmifile.com/961_operator_sg/26/10/2021/d80a05f544a67ed590fc1118cdcf7ae0.png)
Noisy
![Xiaomi Smart Air Purifier 4](https://cdn.statically.io/img/i02.appmifile.com/408_operator_sg/26/10/2021/993daff4a2ab3c9241a4647a7b13911a.png)
Low noise
Large volume air is forced to get through a dense HEPA filter, requires higher fan speed, which will generate higher noise.
Less dense fibers filter is easy to have the air passed even in a high speed, which results in much lower noise.
![Xiaomi Smart Air Purifier 4](https://cdn.statically.io/img/i02.appmifile.com/160_operator_sg/26/10/2021/d5d2821612171eb811a1d4333c41bb6d.png)
Higher energy consumption
![Xiaomi Smart Air Purifier 4](https://cdn.statically.io/img/i02.appmifile.com/630_operator_sg/26/10/2021/44f219a3b90c302c4d540b9fc63010a8.png)
Lower energy consumption
In order to get more clean air, HEPA filter requires the motor to run at a higher speed, which causes higher energy consumption.
Thanks to a less dense fibers filter, Xiaomi's filter consumes less energy to achieve the same volume clean air.