POSITIVE/NEGATIVE AIR PRESSURE ADAPTOR FOR USE WITH RESPIRATORS

摘要

A positive/negative air pressure adaptor for a respirator system. The positive/negative air pressure adaptor has a port region for fluidically coupling a filter cartridge to a respirator. The adaptor has an inlet port for connecting to a positive pressure air source and a first check valve to restrict the flow of air from the port region to the filter cartridge. A second check valve may be provided torestrict the flow of air from the respirator to the port region. When the positive pressure air source is disconnected, the respirator system operates as a negative pressure respirator.