防尘面膜DR88SFT4（带过滤器）

DR88SFT4 (National Certification Pass No. 412) [Specifications] <br>Particle collection efficiency: 99.99% <br>Intake resistance: 110Pa or less<br>Exhaust resistance: 60Pa or less<br>Mass: 240g or less<br>Certification category: RL3 <br>■Features<br>・DOP particle collection efficiency 99.99% (actual average measured by the manufacturer's measuring instrument for filter T4为99.999％）<br> ・包括扬声器，因此即使戴口罩也可以进行清晰的对话。 <br> ・理想是用于预防纳米材料的防尘面膜。