The SR 700 system is a belt mounted Powered Air Purifying Respirator (PAPR) approved with tight fitting full face mask SR 200 and loose fitting hard hat SR 580, face shield SR 570 and Welding shield SR 574/Face shield SR 570 that protects against particulates.It is designed to be used in oxygen sufficient and non-immediately dangerous to life and health (IDLH) environments. The SR 700 PAPR system functions as an alternative to Air Purifying Respirators (APR) in all situations for which these are recommended. This applies particularly to work that is hard, warm or of long-duration. The filtered air is supplied through a breathing hose to the tight fitting Full face mask. The above-atmospheric pressure then generated prevents pollutants from the surroundings from penetrating into the breathing zone.