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Medical-grade H13 filtration for BreatheSmart 45i models. Available at (~$69) and Lowe's (~$69) .

A value pack including HEPA filters and carbon pre-filters for HPA100/200/300 series. Available at (~$63) and Target (~$65) . GermGuardian Air Purifier Replacement Filter B flt4825 Target& more Go to product viewer dialog for this item. where to buy hepa filter

: Mechanical filters typically need replacement every 6–12 months, while carbon pre-filters for odor removal may need changing every 3 months . Air Purifier Buying Guide - Consumer Reports Medical-grade H13 filtration for BreatheSmart 45i models