<p>Instructions:<br>1.If the filter cartidge is damaged, immediately leave the contaminated area and replace the filter cartridge.<br>2.If you feel uncomfortable or have slight odor during use, you must replace the new filter cartridge.<br>3. The effective protection time of the filter box shall be determined according to the wearer's working intensity (respiratory rate), pollutant type, volatility and concentration, and environmental conditions such as humidity and temperature.<br>4. When the filter box is not in use, it should be stored in a well-ventilated, dark and dry environment. It should not be placed with acid, alkali and other toxic substances.<br>Storage environment:<br>Storage temperature: 32-113℉; Storage humidity: <80%; Storage life: 3 years</p>