A IQAir HealthPro Plus helps with new furniture off-gassing in the living room while a Sharp FP-P40CX + Blueair 403 SmokeStop combo does the same in the master bedroom. The lack of electronic controls (403 versus the 450E) means improved durability. As far as I am concerned, the more durable a device is, the lower the overall cost of ownership as warranty claims require that the owner cover shipping costs to the factory. The 403 is the bang-for-the-buck model in the Blueair inventory. The SmokeStop filter with impregnated carbon granules is a great improvement over the standard HEPASilent by providing both lightweight multigas and odor filtration. CADR 240 means that it should be good for rooms up to 240 sqft (regardless of manufacturer claims) through the life of the filter (as ACH declines due to clogged media). Let the unit run 24/7, else cover it when not in use to prevent the accumulation of dust on the exposed internals. Periodically clean the fan with compressed air and vacuum the intake grill/ion brush region/housing floor regularly, regardless of the presence of accumulated dust. Because the filters (made in the USA) are not exactly cost effective (versus the cost of the unit itself), I run a smaller filtration unit (Sharp FP-P40CX) in the opposite corner of the room so that filter media changes can be extended to one year (YMMV, depends on your IAQ). I prefer the single filter cartridge of the 400 series units to that of the triple filter setup found in the 500 and 600 series. And unlike the 500 and 600 series models which intake air from the bottom of the unit, the 400 series models are better suited for placement on carpeted flooring. The Blueair 403 is assembled in China (I have no problem with that) from parts procured from Germany, Sweden and the USA.
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