Full face mask equipped with an inlet air filter

A full face mask equipped with an inlet air filter comprising a transparent visor adjacent a frame to create a space for the flow of air, a rubber gasket adapted to provide water tightness and straps adapted to fit the full face mask on a face,

• the full face mask further comprises a fitting which engages on an upper part of the full face mask in an inspiration mouth and which allows the flow of air to enter the space created between the frame and a user, the fitting comprising a coupling portion adapted to engage in the inspiration mouth and on the opposite side a seat for an attachment of the inlet air filter of the air entering the full face mask in which two compartments are obtained including a main compartment and an oronasal compartment, the main compartment, adapted to be disposed in the area of the user's eyes and cheekbones and the oronasal compartment adapted to be associated with the user's nose and the user's mouth, the main compartment and the oronasal compartment being separated by a separation wall, provided with at least one check valve configure for the passage of air in a direction of inspiration,
• wherein on a centerline in a lower portion of the oronasal compartment there is an exhalation valve for exhalation and configured for the escape of air from said oronasal compartment and from the full face mask,
• in which, inside the seat of the fitting there is a non-return valve designed to prevent the escape of air to the outside of the full face mask from the seat, in a way to during exhalation the air comes out from the exhalation valve for present in a lower part of the full face mask and cannot return to the inlet air filter because the air is blocked by the at least one check valve and the non-return valve at the top of the fitting.