ard ous ▁der mal ▁agents . ▁ ▁A ▁resp ir ator ▁may ▁be ▁something ▁as ▁simple ▁as ▁a ▁head band ▁st rap ▁filtering ▁face pie ce ▁resp ir ator ▁( FF R ), ▁to ▁a ▁head ▁har ness ▁negative ▁pressure ▁full ▁face ▁resp ir ator ▁( air - pur ifying ▁resp ir ator / AP R ), ▁to ▁a ▁full ▁face , ▁tight ▁fitting , ▁closed ▁breath ing ▁air , ▁or ▁open ▁circuit , ▁self - cont ained ▁breath ing ▁appar atus ▁( CC - SC BA ▁or ▁SC BA ). ▁ ▁S pl ash ▁protection ▁▁ ▁Such ▁su its ▁( level ▁B ▁in ▁the ▁US ) ▁are ▁not ▁v apor - t ight ▁and ▁thus ▁provide ▁a ▁less er ▁level ▁of ▁protection . ▁They ▁are , ▁however , ▁worn ▁with ▁an ▁SC BA , ▁which ▁may ▁be ▁located ▁inside ▁or ▁outside ▁of ▁the ▁suit , ▁depending ▁on ▁the ▁type ▁of ▁suit ▁( enc aps ulating ▁or ▁non - enc aps ulating ). ▁They ▁more ▁closely ▁res emble ▁the ▁one - pie ce ▁Ty vek ▁cover alls ▁often ▁seen ▁used ▁in ▁construction ▁and ▁demol ition ▁work . ▁Yet , ▁Level ▁B ▁spl ash ▁su its ▁may ▁also ▁be ▁fully ▁enc aps ulating ▁su its ▁which ▁are ▁simply ▁not ▁a irt ight . ▁ ▁L esser ▁protection ▁( level ▁C ▁in ▁the ▁US ) ▁su its ▁may ▁be ▁cover alls ▁of ▁treated ▁material , ▁or ▁multi - pie ce ▁combinations , ▁se aled ▁with ▁t ape . ▁This ▁kind ▁of ▁protection ▁is ▁still ▁"