cap 66 is placed in an in use position as shown in fig3 exposing the outer filter 72 of the wet chemical air purifier 14 that is below filter 72 the purifier shell 66 is supported by lanyard 60 an elastic band 10 is attached to the oral nasal mask 1 near the edges 7 and 7 39 the passenger extends the elastic band 10 behind the passenger 39 s head 11 to compress the oral nasal mask 1 against the passenger 39 s mouth and nose region 2 to maintain oral nasal mask 1 with a substantially airtight seal around the passenger 39 s mouth and nose region 2 as shown in fig5 the elastic band would allow exhaled air to move out around the edges 7 and 7 39 by reason that the nose mouthpiece has a one way valve to allow air into the mouthpiece from tube 74 to keep a tight seal at all times one way exit valves 90 are located on the nose mouthpiece 1 the elastic band 10 also supports the rest of the respiratory system 12 in place without further assistance the elastic band 10 is flexible and is easily folded into the interior 5 of the oral nasal mask 1 along with a portion of the wet chemical air purifier.