Fixed Grade-D filtration systems are designed to provide breathing air for a specific number of workers. The system filters inlet air to provide respirator users with Grade-D quality air. The first stage element filters bulk water and particulate, the second stage coalescing filter removes atomized oils and ultra-fine particulate, and the third stage removes organic vapors and odors. Filter change indicators are standard on all three filtration stages. Filtration efficiency is 99.99 percentage at 0.01 microns. A high intensity audible alarm and light signals the workers of high CO content in their breathing air. Automatic drains supplied as standard in stage 1 and 2 filters. Filter change indicators on all filters.

Air Systems Breather Box® BB50 Breathing Air Panel Mount Filtration System, D-Grade High Performance Portable with CO Monitor, 9 v Battery, NPT Connection, 50 cfm Flow, 4 People Served, 150 psi, OSHA 1910.134