The mask made of insulating material, complete with replaceable combined filter elements A2B2E2, should provide protection from gases and vapors, as well as from aerosols (dusts, mists, fumes). The mask with replaceable filter elements must be:
1) Well balanced (reduces pressure on the head and neck, ensures a snug fit);
2) Optically adjusted, has no optical distortion, has a subglass, provides a panoramic view through a polycarbonate lens (scratch-resistant), does not fog up inside;
3) Have a speech diaphragm (do not obstruct speech), little resistance to breathing;
4) Equipped with a bayonet filter attachment system to the mask and a removable protective film to protect the panoramic glass from scratches;
5) Have a fastening system of four adjustable straps and a headband;
6) Equipped with an exhalation valve, reducing the accumulation of hot air and moisture formation