BREATHING AIR SYSTEMSSUPPLIED AIR RESPIRATORSThe Tsunami Breathing Air Panel is the optimal solution when Grade D Breathing Air is required. The complete system features industry-leading Tsunami 3-stage filtration along with continuous carbon monoxide monitoring.3-stage Tsunami filtration system with automatic float drains. - Easy to read digital carbon monoxide alarm. - CO Monitor calibration made easy with Autocal . Meets OSHA Grade D breathing air quality specifications. - Multi-User Capabilities: 50 CFM units can serve up to 4 users. - SIZING & ORDERING INFORMATION IMAGE ITEM # MAX CFM PORT SIZE (NPT) DIMENSIONS A 21999-0265 50 " INLET / " OUTLET 16" x 18" x 5" A 21999-0265-CA 50 " INLET / " OUTLET 16" x 18" x 5" B 21999-0980 20 " INLET / OUTLET 13" x 12" x 5" B 21999-0980-CA 20 " INLET / OUTLET 13" x 12" x 5"