Face Dust Cover Breathing Dustproof Mouth-Muffle Activated Carbon Sport Respirator with Extra 4PCS Carbon Filters for Pollen Allergy Bike Mowing Running Cycling Outdoor Activities

الوصف

Product Detail:Face Dust Cover Breathing Dustproof Mouth-muffle Activated Carbon Sport Respirator with Extra 4PCS Carbon Filters for Pollen Allergy Bike Mowing Running Cycling Outdoor Activities. In order for any cover to perform to its maximum it must ba able to seal properly around the nose and mouth so that as much of the air that is being inhaled,is actually passing through the filter.If is not passing through the filter then,no matter how effective the filter is,the user will still be inhaling unfiltered air. FITTING INSTRUCTIONS. It is vary important to press the nosepiece firmly to the nose bridge to form a good seal. The replacing time of filter and valves The effective working life of the filters depends on a number of factors,such as:the breathing rate of the user;ambient levels of pollution;the length of time the filter is actively working;hygiene levels