Abstract: The present invention discloses an anti-flu mask or a respirator to filter air and prevent spreading of virus or pathogens through airborne. The anti-flu mask comprises a filter, a check valve, and a dial or a selector. The filter is configured to filter the airflow and capture up to 99.7% of all particulates or infectious materials. The check valve or one-way valve is configured to control the airflow and allows the air in one direction. The selector is configured to slide smoothly over the check valve and to make the airflow path selection by a user.