[Pre-sale] AirDoctor 4000 • 3-in-1 Filter

*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. Keep your AirDoctor 4000 performing as intended with a genuine replacement filter made specifically for the unit. The AirDoctor 4000 3-in-1 Filter combines the Pre-Filter, Premium Carbon/Gas Trap/VOC layer and UltraHEPA® filter in one replacement. Together, the three stages capture larger household particles, help reduce gases and odours, and filter ultra-fine airborne particles as small as 0.003 microns. There are no separate filters to replace individually. When the time comes, one new filter refreshes all three filtration stages at once. Replacement is recommended approximately every six months for consistent performance.