I understand that there is an uppper duct section in the enclosure. How often do I have to change the secondary filter?

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I understand that there is an uppper duct section in the enclosure. How often do I have to change the secondary filter?

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These filters use the Dupont technology for mechanical dust particle air filtration so they last up to 6 months each and you a set with the enclosure. This is an improvement over the traditional electrostatic air filters in use in elctronic enclosure systems.