Respirable Fibre : A particle with a diameter less than 3 micrometres and a length greater than 5 micrometres and a length to width ratio of greater than 3:1. These fibres can reach the deepest part of the lung
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}