| 摘要 |
<p>A smoke mask comprises a transparent face shield covering a wear's nose and eyes in a substantially airtight manner, and a replaceable air filtration cartridge system attached to the face shield and provided with a conduit leading into the mouth of the wearer, through which he breathes. Exhaled air passes through the air filter in a reverse direction from from that inhaled and never comes into contact with the interior surface of the lens in the face shield, thus eliminating the possibility of fogging.</p> |
