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Maintaining the M320 Air Filters



For optimum cooling, verify the condition of the air filters.


On a regular basis:

  • Check the air filters for dust and debris. Replace the filter elements . The filter elements degrade over time, so the filter elements in use, as well as spares, must be replaced every six months. For procedures to replace the air filters, see Replacing an M320 Air Filter .

  • Spare filter elements should be used within 1 year of manufacture. Check the date of manufacture printed on the filter. Store spare filter elements in a dark, cool, and dry place. Storing the filter elements at higher temperatures, or where they can be exposed to ultraviolet (UV) radiation, hydrocarbon emissions, or vapors from solvents, can significantly reduce their life.


Always keep both air filters in place while the router is operating. Because the fans are very powerful, they could pull small bits of wire or other materials into the router through the unfiltered air intake. This could damage the router components.