Airdog X3 Air Purifier
For a bedroom or small office. Almost no replacement costs. CARB certified. Ozone numbers published below.
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THE OZONE QUESTION
Airdog's technology is ionic rather than HEPA, which produces a small amount of ozone as a byproduct. Most sites selling these don't mention it. Here are the numbers.
The X3 is certified by the California Air Resources Board and tests at roughly 0.01 parts per million (ppm) over 24 hours — a fifth of CARB's 0.05 ppm limit. If you know you're ozone-sensitive, a straight HEPA unit with no ionization is the more conservative choice. If you're not, this is well within the safety margin.
THE ROOM SIZE MISTAKE ALMOST EVERYONE MAKES
Airdog rates the X3 at 860 square feet — but that's one air change per hour. For asthma and allergies you want four or five.
Airdog says so themselves: they recommend 215 sq ft for four changes per hour, 287 for three. So use 215 as your real number. It clears that space in about 15 minutes.
A bedroom. A small office. A nursery. That's what this is for.
ALMOST NOTHING TO REPLACE
The collecting plates wash with soap and water — they're even dishwasher safe on a low temperature setting. Dry them fully before they go back in; Airdog recommends leaving them at least 24 hours.
The ionization wire frame cannot touch water. It's cleaned with a paper towel or a chalk eraser.
The composite catalyst refreshes itself in direct sunlight in about an hour.
The one genuine consumable is that catalyst filter. Airdog says it lasts 6 to 24 months depending on pets and cooking, and a replacement costs about $29.
Compare that to HEPA filters at $40 to $100 each, several times a year. Not zero, but close to it.
QUIET ENOUGH TO ACTUALLY SLEEP NEXT TO
Around 30dB on low — noticeably louder at higher speeds. Sleep mode dims the display and drops the fan speed on its own.
There's also a night light with a motion sensor: light when you get up, darkness when you don't. Exclusive to the X3.
FILTRATION
Captures particles down to 14.6 nanometers, roughly 20 times smaller than the 0.3 micron threshold HEPA filters are tested to. Airdog says it destroys over 99.9% of germs rather than trapping them.
The display shows a live air quality reading from 0 to 500, and a light at the base changes colour with it — green for excellent, yellow-green for good, yellow for moderately polluted, red for hazardous.
BEFORE YOU BUY
Airdog offers a 30-day home trial, so you can find out whether it makes a difference in your own house.
And air purifiers may qualify as a medical expense under HSA or FSA rules. Worth checking with your plan.
SPECIFICATIONS
Clean air delivery rate: 120 CFM
Coverage: 215 sq ft (4 air changes/hr), 860 sq ft (1 change/hr)
Noise: around 30dB on low
Speeds: 4 manual, plus Auto
Dimensions: 9.8" x 9.8" x 19.6"
Weight: 14.3 lbs
Connectivity: Wi-Fi, app compatible
Safety: child lock, auto power-off when back cover removed
Certification: CARB certified
