Seven air purifiers that passed the initial evaluation were checked for their effectiveness in getting rid of particulate matter and smelled in a test workplace measuring ten by 13 by 8 feet high. This gave us a 145-square-foot test area, corresponding to a midsize to a small bedroom.

Making use of my eight years of patients surviving airborne particles, three materials were chosen to create a dirty, particle-filled room. Flaming from two Diamond safety fuses produced small smoke particles (1.009-1.297 micron); 4 milligrams of a white, powdered titanium dioxide, usually utilized to supply the white paint in plastics and paints, was used to produce midsize particles (0.3-1 micron); and 25 milligrams of a brown powder, an ISO dust example, was utilized for the 1-20 micron particles.

After determining the knowledge planes of fine and coarse particles, I wore a 3M N95 Particle mask, shatterproof glass, and ear protection. I lit and burned two matches, then entered the two powders utilizing a high circulation of stored nitrogen gas through a system venturi nozzle, much like a carburetor, but on a bigger scale. Use the best HEPA air purifier.

Particle counts, as covered with expert grade devices used for atmospheric research study (TSI Inc. 3080/3010 Scanning Movement Particle Sizer and 3321 Aerodynamic Particle Sizer), jumped a hundredfold from clean background levels of 480 particles per cubic centimeter (#/ cm ^ 3) to 49,239 for smaller flaming particulate matter and from 9 to 999/ cm ^ 4 for the bigger titanium dioxide and dust particles. The particles were too small to detect by eye, so no visible change was seen, though I might smell the vapor from the matches. After releasing, I started the air purifier and rapidly left the room.

The particle concentration after 5 minutes was associated with that of the initial reading. Trials were repeated three times, and the results balanced.

The resulting data is related to what you would obtain from a CADR rating but better in 2 crucial elements. We had the ability to determine the machines' efficiency at removing much smaller sized particles, and it accounts for noise levels so that a fast however unbearably powerful device will not score as high thinking that it would have to decrease its fan speed to compete.

With no cleaners running, the particle concentration reduced throughout 8 minutes so that 73% of smoke particles remained and 83% of titania and dust bits remained.

All air purifiers were effective at lowering the particle concentration in all size ranges, but one device stuck out: the Blueair 503. It was able to reduce that to 7% and 6% respectively. The next closest competitor was the Sharp Plasmacluster FP-A80U Air Cleanser, which left 22% of smoke and 18% of titania and dust particles staying. The Rabbit Air MinusA2 SPA-700A, Coway AP-1512HH Mighty, and Winix PlasmaWave 6300 Air Purifier all produced similar excellent outcomes, leaving 30% or less of the particles. The heralded IQAir New Edition HealthPro Plus put in only a reasonable proving, leaving 32% and 33% of particles. The Austin Air HealthMate Requirement HM400 Air Cleanser performed noticeably even worse at this test, most likely since it was operated on the lowest setting to meet the sound level requirement.