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WebbSo, regarding gas filters, the classes describe the maximum permissible concentration of toxic substances a filter can take. For particle filters, the filter class clearly indicates … Webb9 apr. 2024 · 2. P3 filters are rated highest among P1 and P2 filters. 3. They protect wearer from higher levels of dust. 4. They give protection against solid and liquid aerosols. 5. These can be used in pharmaceutical industries, chemical industries, pesticides, and where level of hazard is high. 6. WebbCPAP, Auto CPAP, and BIPAP F&T Respiratory Care. (972) 996-4581. 10850 Harry Hines Blvd Suite 140 Dallas Tx 75220. [email protected]. scott atwater outboards