Designed for Laser FiltrationThe iKier D4 air purifier features a 3-layer filter design achieving a purification efficiency of up to 99.97%.Brushless Motor for Quiet OperationThe power system uses a single-phase brushless motor for strong suction and quiet operation with noise levels ≤68dB.Adjustable SpeedThe electrical system incorporates our specially designed advanced modular circuit board allowing for multi-level speed adjustments.Long LifespanA single filter cartridge (when replacing the initial and medium-efficiency filters) can continuously work for approximately 40 hours during normal laser cutting of wood providing long-term effective protection.Easy to ReplaceThe filter can be changed quickly within five minutes without disassembling any circuits in just three steps.