<HTML><FONT FACE=arial,helvetica><HTML><FONT COLOR="#0000ff" SIZE=2 PTSIZE=10 FAMILY="SCRIPT" FACE="Comic Sans MS" LANG="0"><B>You need a charcoal filter 3M has disposable ones that come in a resealable bag that are good for around 40 hrs exposure time. The part number is 7192 for medium and 7193 for chubbier cheeks.<BR>
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Tim</B></FONT></HTML>