[Pre-sale] AirDoctor 4000 • 3-Stage Air Purifier + 1 Year Filter Combo Pack

*The new AirDoctor 4000 is now available on pre-sale at a special introductory price for a limited time. Shipping is expected to begin in mid-November. Start with cleaner air and your next two filter changes already sorted. The AirDoctor 4000 + 1 Year Filter Combo Pack pairs the purifier with 2 additional AirDoctor 4000 3-in-1 Replacement Filters, so you can enjoy the benefits of the AirDoctor 4000 without having to think about ordering a new filter every few months. Designed for larger rooms and open-plan spaces, the AirDoctor 4000 uses advanced 3-stage filtration to tackle a broad mix of indoor air pollutants. The Pre-Filter captures larger particles such as dust and pet hair, the Premium Carbon/Gas Trap/VOC layer helps reduce household odours, gases and VOCs, and the independently tested UltraHEPA® filter captures 99.99% of airborne particles as small as 0.003 microns. Your AirDoctor 4000 already comes with its first filter installed. This pack adds 2 replacement filters, with each one bringing all three filtration stages together in a single replacement. As replacement is recommended approximately every six months, the complete pack gives you around 1.5 years of filtration in total, depending on how often you use your purifier and the air quality in your home. It is a simple way to plan ahead. Your purifier is ready to use from day one, and when the filter indicator tells you it is time for a change, your next replacement is already there.