Half-Mask Respirator : A half-mask respirator covers the user's nose and mouth and is fitted with either cartridges or canisters to filter for sprays and vapours.
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}