Xiaomi Smart Air Purifier 4 Pro Filter

Less clean air 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. Noisy 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. Higher energy consumption 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.