3M - Fitted with the proprietary 3M™ Cool Flow™ Valve, 3M™ 9211 N95 mask allows for easy exhalation while protecting you from particle pollutants detrimental to your health. | Facebook
3M Respirator P2 Face Mask with Cool Flow Valve – Medsales
Cool Flow Valve | Respiratory Protection | 3M - US
3M N95 9211 model NIOSH approved respirator with Cool FlowTM valve.
3M™ Exhalation Valve Assembly FF-400-07, 5 ea per case 7000052738 | Ward-Kennedy