9 SAFETY EQUIPMENT, NAMELY, BREATHING AIR PACKAGE CONSISTING OF AN AIR COMPRESSOR, A POWER SOURCE, AN AFTERCOOLER, A DRYER, A PARTICULATE FILTER, A CATALYTIC CONVERTER FOR CARBON MONOXIDE, A CARBON MONOXIDE MONITOR AND A CONTROL PANEL WITH WARNING LIGHTS AND SIGNAL HORN, ALL MOUNTED ON AN INTEGRAL BASE WITH CASTERS FOR PORTABILITY, FOR USE IN PROVIDING GRADE D BREATHING AIR IN A HAZARDOUS ENVIRONMENT