This 20mm dc axial fan is aimed at smaller thinner low power consumption low vibration low noise and extra design good for long-term use. Widely-used products in the air detection sensor in the air purification product it's a key component that can help air diversion intake and remove stale air detect airborne particles PM2.5 and other pollutants. it work with high-precision sensors to provide accurate data and make product has good performance.The product series is RoHS compliant and is also certified according to many quality management accreditation systems and has gained various accreditations such as UL TUV and VDE. Every model undergoes rigorous testing to achieve minimum noise under high airflow and air pressure conditions. All models are meet strict reliability requirements.