... air breathing apparatus RHZKF6.8/30 positive pressure air breathing apparatusPerformances A.Rear panelRear panel fits human engineering design, ... made of carbon fiber composite materials. Both rear panel and braces are anti-flaming, waterproof and anti ... breathing resistance, stable airflowD.MaskSocket with mask at all angles, with simple structure, easy to maintain.Positive pressure, avoid poisonous ...