If in doubt, please send us serial numbers of your units so we can ensure you are receiving the proper filters for your specific unit(s) especially since filters are not returnable.
Pre-Filter: Can be visually inspected: When both sides are of similar color should be changed, regular household usage would require Renewal 3-6 months You can vacuum every 2-3 months and replace every 6 months if need be.
Tar Trap Prefilter typically need to be changed more frequently. Renewal 2-3 months
UV lamp (if applicable) is recommended to change yearly. Renewal 12 months
HEPA Filter: Can be visually inspected: When both sides are of similar color = should be changed, regular household usage would require Renewal 2-3 years
Carbon Filter: Found inside the unit in a canister from a few inches away, smell the exhaust and if an unpleasant sour odor is emitted that is an indication for renewal, regular household usage would require. Renewal 2-3 years
PS: The above estimated time periods all variable and dependent upon your usage and the contaminants in a given area. The above can be used as a general guideline.
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