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  • Filters designed to remove unwanted material from the air stream that passes through them. Filters may be designed for particulate filtration and/or gas and vapor removal (air cleaning), the mechanisms for particulate filtration and/or gas-phase removal are very different from each other. Air filters are used in many different equipment, including air cleaners and heating, ventilation, and air conditioning (HVAC) systems. Small disposable filters (e.g., cartridges, canisters) are used in respirators and masks for personal protection.
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