Genuine AirDoctor AD4000 Replacement Filter. Includes 1 Filter Unit w Pre-Filter, Premium Carbon/VOC, & UltraHEPA. Guaranteed Quality & Performance. Removes Smoke, Pet Dander & Pollen — Open-Box

Name: Genuine AirDoctor AD4000 Replacement Filter. Includes 1 Filter Unit w Pre-Filter, Premium Carbon/VOC, & UltraHEPA. Guaranteed Quality & Performance. Removes Smoke, Pet Dander & Pollen
Brand: AIRDOCTOR
SKU: awhd-us-b0g31xh9bd
Price: 113.95 USD
Availability: InStock

Brand: AIRDOCTOR

Condition: Used

$113⁹⁵

Updated: 5 hours 5 mins ago

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Description

GENUINE FILTER FOR AD4000 Includes 1 filter set. Each set includes a Pre-Filter, Premium Carbon/VOC, & UltraHEPA. For optimal performance, use genuine AirDoctor filters only. These have been 3rd-party tested & certified for maximum efficiency

DESIGNED FOR EASY REPLACEMENTS 1. Remove the plastic bag 2. Detach the cover & take out the old filter 3. Insert new filter 4. Turn the device on & hold down the auto/dim buttons to reset the filter light 5. Enjoy up to 6 months of clean air

3 STAGE FILTRATION The Pre-Filter, Premium Carbon/VOC, & UltraHEPA work as a powerhouse to capture unwanted guests, leaving you feeling refreshed. Our fully sealed system ensures that the bad particles leave for good & aren't recirculated into your air

REMOVES VIRTUALLY ALL AIRBORNE PARTICLES Proven to capture 99.99% of airborne particles at 0.003 microns. 100x smaller than the HEPA standard. Helps reduce dust, smoke, pollen, pet dander, and other airborne irritants for cleaner indoor air

THE GOLD STANDARD Our UltraHEPA filters are manufactured in Japan for reliability & performance. Our Premium Carbon/VOC filters are made with activated carbon and potassium permanganate to absorb & break down gases and airborne chemicals like Formaldehyde, Toluene, Benzene, Ozone, Nitrogen Dioxide

DEODORIZATION Don't just mask odors, neutralize them at the source. Our Premium Activated Carbon/VOC filter absorbs and breaks down odors so that your home smells fresh & clean

AWARD WINNING Our award-winning air purifiers aren't made by accident. Each piece is intentionally crafted to give you peace of mind. 2024 & 2025 Best Air Purifier by Newsweek, 2025 #1 Air Purifier by Greenmatters, 2025 #1 Air Purifier by Scary Mommy

ONLY AIRDOCTOR REPLACEMENT FILTERS provide guaranteed performance for your AD4000. Avoid after-market replacements, they may not work as intended & harm your unit

Official genuine replacement filter set for AirDoctor 4000

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Product Details

SKU:: awhd-us-b0g31xh9bd
Model:: 10AD400RF01
Country:: US
ASIN:: B0G31XH9BD
UPC:: 874617005617

Shopping Smarter

Common questions about buying open-box and refurbished.

Why buy refurbished or open-box?

Refurbished and open-box products offer the same performance as new at a fraction of the price. They've been inspected, tested, and are ready to use — the only difference is the price tag. Buying refurbished also reduces electronic waste, extending product life cycles and keeping functional devices out of landfills.

What's the difference between open-box and refurbished?

Open-box products are customer returns that have been inspected and confirmed functional. They may show little to no use — often the item was returned simply because the buyer changed their mind. Refurbished products have been professionally repaired or restored by technicians, tested to meet or exceed manufacturer specifications, and sometimes come with a warranty. Both are a smart alternative to buying new.

Why use OpenBoxFox?

Finding refurbished deals is time-consuming — you'd have to check Amazon Warehouse, Reebelo, Dyson Outlet, and others separately for AIRDOCTOR products. OpenBoxFox aggregates these listings in one place, so you can compare and find the best deal without the legwork. We update pricing daily so you always see current availability and real savings.

Is it safe to buy refurbished?

Yes. Products listed on OpenBoxFox come from established retailers like Amazon, Reebelo, and Dyson — not unknown third-party sellers. Each retailer has buyer protection policies, return windows, and in some cases warranties. You get the price advantage of used goods with the purchase security of a known retailer.