Belte r r a Cor p or at ion S afety M an ual D oc I D C H S M BE L 2 0 1 7 Pa g e 2 42 of 53 8 Ta ble 2 Hi g he st Ha z a r d R a ti on fo r Sele c ti ng a R e spira tor P APR P owe re d Air P urif y in g R e spir a tor S C B A S e lf C ontaine d B re a thi ng Appa r a tus S uppli e d a ir r e spira tor with an a ddit ional a ir sup pl y usua ll y a c y li nde r u se d shoul d the P rima r y a ir suppl y fa i Doc u m e n t Id e n tif icat ion S E L 033 P age Nu m b e r 9 of 14 Doc u m e n t C r e ation Dat e Ma y 2 2015 Im p le m e n tat ion Dat e J une 30 2015