The Clean Air Journal

Airpura R714 air purifier
Airpura R714 review: Super HEPA at 635 CFM, and who needs it
The Airpura R714: Super HEPA, 635 CFM and 18 lbs of carbon for large or tall rooms. Who it suits, and when the R600, R614 or R700 is the better... Read more...
Airpura air purifier
True HEPA vs Super HEPA vs HepaBarrier: Airpura's three particle filters
What each Airpura particle filter catches, which models use it, and which one you actually need. Read more...
Airpura R600 air purifier
Airpura R600 review: specs, sound, room size and who it suits
The Airpura R600 in one page: 18 lbs of carbon, True HEPA, 560 CFM, 35 to 62 dB, what it does well, what to know, and which sibling to pick... Read more...
Airpura air purifier
Airpura replacement filters: which one fits your model
Every Airpura model and the filters that fit it, from the R400 to the UV714, with prices and the three ordering mistakes to avoid. Read more...
Austin Air HealthMate Plus air purifier
Austin Air replacement filters: which one fits your model
The main filter and pre-filter for every Austin Air machine, with part numbers, prices and what the A and B mean. Read more...
Austin Air HealthMate air purifier
Black Friday air purifier deals 2026: how to spot a real one
The real deal is the lowest five-year cost, not the biggest discount. What to check, and our offer: a free spare pre-filter with every machine, Nov 20 to Dec 1. Read more...
Airpura R600 air purifier
Airpura R600 vs AirDoctor 5500: large-room purifiers compared
Two large-room purifiers. Where the AirDoctor 5500 wins, where the Airpura R600 wins, and the five-year cost of each. Read more...
Austin Air HealthMate Plus air purifier
Austin Air HealthMate Plus vs AirDoctor 3500: price, carbon and 5-year cost
The AirDoctor 3500 is cheaper to buy; the HealthMate Plus is cheaper to own. Specs, where each one wins, and the five-year math. Read more...
Airpura V600 air purifier
Airpura V600 vs C600: treated carbon and True HEPA, or more carbon?
Two Airpura chemical machines with opposite trade-offs: 18 lbs of treated carbon with True HEPA, or 26 lbs of carbon with a 95% barrier filter. Read more...
Airpura R614 air purifier with Super HEPA
Airpura 600 vs 614: Super HEPA vs True HEPA, and is it worth it?
The Airpura models ending in 14 are the same machines with a Super HEPA filter. What changes, what it costs, and who should pay for it. Read more...
Austin Air HealthMate Plus Junior air purifier
HealthMate Junior vs HealthMate Plus Junior: which to buy
The same compact Austin Air machine with a different carbon. What the Plus Junior adds for $50, filter costs, and which one fits your room. Read more...
Airpura R400 air purifier
How long does an air purifier take to clean a room?
Minutes, not hours, if the machine fits the room. The air-change math, how many air changes each of our machines gives your room, and how to make it work faster. Read more...