AIRDOCTOR AD4000 Air Purifier. Perfect for Large Rooms, Basements Up to 2,776 ft…

Price: $799.00 - $577.15
(as of Jul 18, 2026 02:14:07 UTC – Details)

Product description

How to Change the AirDoctor Filter
Step 1

Make sure the unit is turned off, then gently pull the top of the filter cover toward you to remove it

Step 2

Slide the ORANGE filter lock lever to the right to unlock the filter plate

Step 3

Remove the old filter by lifting and pulling the tabs on top and bottom of the filter

Step 4

Insert your new filter by following the arrows, and aligning the channel on the bottom

Step 5

Once the filter is in place, slide the ORANGE lever to the left to lock the filter in place

Step 6

Align the upper part of the filter cover and snap it back into position

Product Dimensions ‏ : ‎ 19.7 x 32.3 x 19.7 inches; 19.95 Pounds
Item model number ‏ : ‎ AD4000
Date First Available ‏ : ‎ April 21, 2026
Manufacturer ‏ : ‎ AIRDOCTOR
ASIN ‏ : ‎ B0GY274753
Best Sellers Rank: #44,038 in Home & Kitchen (See Top 100 in Home & Kitchen) #148 in HEPA Filter Air Purifiers
Customer Reviews: 4.8 4.8 out of 5 stars (59) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });

LARGE ROOM COVERAGE: Suitable for large bedrooms, kitchens, and larger shared spaces. Rapidly cleans 630 ft2 in 15 minutes & up to 2,520 ft2 in 1 hour, delivering consistent purification where you sleep, work, and relax
HOSPITAL-GRADE ULTRAHEPA FILTRATION: AirDoctor AD3500 uses UltraHEPA filtration to capture 99.99% of airborne particles at 0.003 microns, 100x smaller than the HEPA standard. Removes dust, smoke, pet dander, and more
PREMIUM ACTIVATED CARBON FILTER FOR GASES & ODORS: Reduces toxic gases, odors, pet smells, cooking fumes, gas emissions, wildfire smoke, and VOCs. Made with activated carbon and potassium permanganate to absorb and break down gases and airborne chemicals
REMOVES COMMON INDOOR AIRBORNE POLLUTANTS: 3-stage filtration, backed by rigorous third-party testing, removes dust, smoke, pet dander, pollen, and odors. Includes a Pre-Filter, Premium Activated Carbon filter, and UltraHEPA filter
AUTO MODE WITH AIRDOCTOR HALO: PM2.5 sensors monitor air in real time while the Halo displays color-coded quality levels. Auto Mode adjusts fan speed and activates Boost when needed. Includes timer, filter indicator, and 6 fan speeds
PROVEN BY SCIENCE, BACKED BY TESTING: Supported by independent third-party testing and built on a commitment to transparency, performance, and scientific validation
QUIET OPERATION: Designed for whisper-quiet performance so you can enjoy clean air without disruption. Runs quietly day and night while you sleep, work, or relax
SUPPORT YOUR WELLNESS ROUTINE: Cleaner air supports better sleep, breathing, and overall wellness
GENUINE REPLACEMENT FILTERS: For optimal performance, use genuine AirDoctor filters. All-in-one filter system. Replace every 6 months. UltraHEPA filters are made in Japan for durability, performance, and long-lasting reliability
FSA AND HSA ELIGIBLE Eligible for FSA and HSA reimbursement so you can use pre-tax dollars toward cleaner air and better wellness

Product summary

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