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Oct 14, 2009 · In studies comparing the performance of surgical mask filters using a standardized airflow, filter performance has been shown to be highly variable. Collection efficiency of surgical mask filters can range from less than 10% to nearly 90% for different manufacturers masks when measured using the test parameters for NIOSH

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Q7How often is the N95 mask should be replaced or changed? A7The protective effect of any type of mask is time consuming and must be replaced regularly. It is currently in a special period. In many popular videos of wearing masks, it is reminded repeatedly that masks must not be reused. It is recommended to replace the masks every 2 to 4 hours.

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Considerations when using a surgical mask for suspected or confirmed cases. In the majority of situations where standard respiratory protection is needed, a single use surgical mask is appropriate (minimum Level 1 barrier). Refer to Appendix 2 for AS 43812015 Single use surgical face mask