This Filter Symbols Legend CAD sheet is a practical reference for P&ID and process drawings. It includes a variety of standard symbols used to represent air, gas, and liquid filtration equipment, making it easier to keep your schematics consistent and readable across design, construction, and operations teams.
The legend typically includes symbols for:
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General filter and alternative filter symbol styles
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Air filters (including roll air filter / air filter variations)
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Gas filters and cartridge gas filters
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Liquid filters and fixed-bed liquid filter symbols
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HEPA gas filter / high-efficiency filter representation
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Fixed bed air filter symbols
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Rotary filter and rotary liquid filter symbols
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Press filter symbol
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Specialty filter types shown on the sheet such as:
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Biological filter
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Ion exchanger filter
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Oxygen-enriched filter
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“Primary / mid-effect” filter symbol style (as labeled)
Use this CAD legend for:
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P&ID documentation sets and process utility diagrams
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Water treatment, HVAC/process filtration systems
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Standard symbol libraries for drafting teams
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Faster drafting + QA checks for consistent filter notation