Vaccination against COVID-19 is of great importance. On the one hand, almost everyone is susceptible to the COVID-19 virus; the vast majority of infected people develop the disease, and some even progress to severe or critical illness or death, while COVID-19 vaccination can confer immunity on most people. On the other hand, COVID-19 vaccination can build an immune barrier in the population, block the continuous transmission of the virus and prevent the pandemic of COVID-19.
Until the population immune barrier is fully established, even if some people have been vaccinated, public awareness and measures for epidemic prevention and control must not be relaxed. Therefore, masks should still be worn after vaccination.
Requirements for testing indicators of ventilation resistance and airflow resistance in various mask standards:
GB 2626-2006 Respiratory Protective Devices: The total inspiratory resistance of the mask shall not exceed 350 Pa, and the total expiratory resistance shall not exceed 250 Pa;
LFY-711 Respiratory Resistance Tester
GB 19083 Medical Protective Masks: At a gas flow rate of 85 L/min, the inspiratory resistance shall not exceed 343.2 Pa (35 mmH₂O);
LFY-706C Particulate Filtration Efficiency and Airflow Resistance Tester
GB/T 32610 Daily Protective Masks: The inspiratory resistance of the mask shall be no more than 175 Pa, and the expiratory resistance shall be no more than 145 Pa;
LFY-711 Respiratory Resistance Tester
YY 0469 Medical Surgical Masks: Pressure difference shall not exceed 49 Pa;
YY/T 0969 Disposable Medical Masks: Ventilation resistance shall not exceed 49 Pa/cm².
LFY-709 Gas Exchange Pressure Difference Tester for Medical Masks
