CLEAN & FRESH AIR QUALITY: Replacement D Filter with Pre-Filter and Activated Carbon Layer for Holmes AER1 Air Purifiers helps capture pollen, dust, and odors to support cleaner indoor air. TRUE HEPA FILTRATION: Captures up to 99.97% of airborne particles as small as 0.3 microns, including common allergens. LONG-LASTING PERFORMANCE: Designed to last approximately 6 months under normal use. EASY INSTALLATION & REPLACEMENT: Compatible with Holmes Air Purifier Model AER1 (Filter D); simply replace when the filter indicator light alerts you. No tools required. QUALITY CONSTRUCTION: Made with premium materials to deliver consistent filtration performance. Color: Purple and Black Material: Composite Package Includes: 4 × Replacement Filters 8 × Carbon-Infused Sponge Pads Note: Actual product color may vary slightly due to monitor settings and lighting conditions. Measurements may vary by ±1–3 cm.