3500 Replacement Filter Compatible with Air Doctor 3000, 3500, 3500i Air Purifiers, Includes 1 Efficiency Filter, 2 Activated Carbon Filters, 4 Per-Filters

Perfect CompatibilityThis 3500 filter replacement is perfectly compatible with AirDoctor 3000, 3500, and 3500i air purifiers. The brand names used are to demonstrate compatibility | Value-for-Money One-Year Pack: This product contains 7 items, including 1 main filter, 2 activated carbon filters, and 4 pre-filters, allowing you to enjoy comfortable air for a year without worrying about air issues | Multi-layer high-quality filtration: Triple filtration ensures protection; the pre-filter layer filters out large particles such as hair fibers; the activated carbon layer deal with odors (smoke, kitchen fumes); and the main filter filters out small particles such as dust, pet dander and pollen | Meets multiple needs and install easy: Suitable for use at home, school, and office, replacing the 3500 air filter is quick and tool-free. Simply remove the plastic packaging from the new filter before installation | Replacement Recommendation: For optimal performance, it is recommended to replace the activated carbon every 6 months and the main filter every 12 months or depending to the usage