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Disposable respirators are designed to provide reliable protection while maintaining a lightweight, secure fit with comfort features. These respirators provide comfortable protection against certain solid and liquid particles, and certain models provide an exhalation valve to reduce heat and humidity build-up inside the respirator. Filtration efficiency differs between models, with minimums rated for meeting OSHA regulations set at those specific levels for protection against solid and liquid aerosols. Resistance to oils depends on selected model. Air-purifying respirators filter airborne particles and helps control and prevent disease and can be used in any working environment.