Face mask apparatus with secondary filter

A face mask apparatus for filtering air, the face mask apparatus comprising:

• a face seal for providing an airtight flexible seal around the nose and mouth of the user;
• a support sealably attached to the face seal, wherein the support has an open area that allows for passage of incoming air;
• a front shell for removably attaching to the support, wherein the front shell has at least one inlet hole for allowing the incoming air to pass through the open area of the support;
• a filter for filtering particulate elements from air, wherein the filter is configured to be housed between the front shell and the support, and the face seal provides a direct connection between the filter and the user;
• and
• a receiver projecting from an exterior surface of the front shell for receiving a secondary mask.

A face mask apparatus for filtering air, the face mask apparatus comprising:

• a face seal for providing an airtight flexible seal around the nose and mouth of the user;
• a support sealably attached to the face seal, wherein the support has an open area that allows for passage of incoming air;
• a front shell for removably attaching to the support, wherein the front shell has at least one inlet hole for allowing the incoming air to pass through the open area of the support;
• a filter for filtering particulate elements from air, wherein the filter is configured to be housed between the front shell and the support, and the face seal provides a direct connection between the filter and the user;
• and
• a secondary filter releasably secured to an exterior surface of the front shell and disposed upstream of the at least one inlet hole to pre-filter an air flow entering the inlet hole.

A filtration method, comprising:

• applying a face mask apparatus to a face of a user, the face mask apparatus including a primary face mask to cover a nose and a mouth of the user and having a face seal for providing an airtight flexible seal around the nose and mouth of the user, the face mask apparatus including an inhalation passage through the face mask apparatus, a primary filter received in the inhalation passage to filter air passing through the inhalation passage;
• applying, while maintaining the face mask apparatus on the face of the user and the primary filter in the inhalation passage to filter air passing through the inhalation passage, a first secondary filter to the face mask apparatus to filter air prior to the air passing through the inhalation passage;
• removing, while maintaining the face mask apparatus on the face of the user and the primary filter in the inhalation passage to filter air passing through the inhalation passage, the first secondary filter and disposing of the first secondary filter;
• and
• applying, while maintaining the face mask apparatus on the face of the user and the primary filter in the inhalation passage to filter air passing through the inhalation passage, a second secondary filter to the face mask apparatus to filter air prior to the air passing through the inhalation passage.