AirDoctor AD5500 3-Stage UltraHEPA Air Purifier vs PuroAir 400 HEPA Air Purifier
These are side-by-side facts taken from each product guide: published specifications, strengths and caveats as their sources state them. This page is not a test, a ranking or a verdict about which model is better.
AirDoctor AD5500 3-Stage UltraHEPA Air Purifier
Large open rooms around 1,000 sq ft with space for a tall floor unit
AirDoctor's AD5500 runs two sets of pre-filters, carbon filters and UltraHEPA filters. AirDoctor gives 1,043 square feet at four air changes per hour and a 556 CFM smoke CADR. It stands 28.75 inches tall, needs paired filter changes, and carries a one-year warranty.
Published specifications
- AirDoctor: 1,043 sq ft at 4 air changes per hour
- AirDoctor: smoke CADR 556 CFM (standard not stated)
- AirDoctor: 16 x 16 x 28.75 in, 33 lb
- AirDoctor: two pre, two carbon, two UltraHEPA filters
- Listing: carbon every 6 months, UltraHEPA every 12
- AirDoctor: one-year limited warranty, service fee applies
Strengths
- High airflow for large open rooms per the maker's figures
- Two permanent pre-filters listed in the box contents
- Six fan speeds per the listing
Caveats
- Every filter change is a pair of filters
- Listing coverage figures differ from AirDoctor's
- One-year warranty; no manual found online
Read the full AirDoctor AD5500 3-Stage UltraHEPA Air Purifier guide
PuroAir 400 HEPA Air Purifier
Buyers wanting auto mode and a child lock who accept unpublished CADR
The PuroAir 400 uses one composite filter with an air-quality sensor, auto mode, timer and child lock. PuroAir claims 2,000 square feet an hour but publishes no CADR, and its manual gives both 8-inch and 3-foot clearances. Two-year warranty with registration.
Published specifications
- PuroAir: up to 2,000 sq ft in an hour; no CADR published
- PuroAir: 14.4 L x 8.1 W x 21.5 H in, 14.7 lb, 80 W
- Manual: auto mode, fan speeds, 2/4/6/8 h timer, child lock
- Manual: >8 in from obstacles; 3 ft from appliances
- Manual: filter not washable; reset hold 10 s
- Manual: two-year warranty with registration
Strengths
- Auto mode with a sensor that calibrates on power-up
- Timer and child lock
- Manual describes a sensor test at 12 inches
Caveats
- No CADR or verified room size published
- Manual gives conflicting clearance distances
- Humidity can push auto mode to higher speeds
How to choose between them
Choose the AirDoctor AD5500 3-Stage UltraHEPA Air Purifier if your situation matches: Large open rooms around 1,000 sq ft with space for a tall floor unit. Its main caveat: Every filter change is a pair of filters.
Choose the PuroAir 400 HEPA Air Purifier if your situation matches: Buyers wanting auto mode and a child lock who accept unpublished CADR. Its main caveat: No CADR or verified room size published.
Both entries repeat what each guide records. Confirm the model, included parts and availability on the current listing before ordering.
Primary sources
- AirDoctor product page for the AirDoctor 5500 Source for AirDoctor AD5500 3-Stage UltraHEPA Air Purifier
- AirDoctor one-year limited warranty page Source for AirDoctor AD5500 3-Stage UltraHEPA Air Purifier
- PuroAir product page for the PuroAir 400 Source for PuroAir 400 HEPA Air Purifier
- PuroAir 400 user manual Source for PuroAir 400 HEPA Air Purifier
- PuroAir user manuals index Source for PuroAir 400 HEPA Air Purifier
Primary sources checked .