Its adjustable head harness helps you find the ideal fit while the large polycarbonate visor provides face protection and a wide field of vision. Connect the breathing hose to the power unit and select from the Sundstrm range of filters to provide breathable air to the wearer. About- Respirator face shield for use with the Sundstrm SR 500 EX powered respirator (available separately) Can also be used with the SR 507 compressed-air supply regulator but only in non-explosive environments Polycarbonate visor is resistant to impact and scratches, and provides a wide field of vision ATEX-approved for use in potentially explosive environments Visor can be flipped up when not in use Replacement visors are available separately Air supply keeps the visor demisted Adjustable head harness for a great fit Replaceable, flexible breathing hose Equipped with exhalation valve It is essential that a risk assessment is carried out by a competent person before work is started in a potentially