3 Packs HE402 Replacement Filter for Shark HE400 HE401 HE402 HE405 4 Fans Air Cleaner Purifier, 3 Stages Filtration with H13 True HEPA, Activated Carbon Filters And Fine Pre-fillter, Part # HE4FKPET $82.98 $ 82 . 98 ($27.66/Count)

The fresh filter is HEPA layer captures 99.9% of airborne particles down to 0.1 mic, while the carbon helps trap smoke vapors, cooking smells, fumes, and volatile organic compounds (VOC's). Both compact and powerful, breathe smart FIT50 cleans an impressive 900 sq. ft. every 30-minutes. Oneida's filters are rated at 99.97% efficiency at .3 microns, my Wynn nano filter is rated 99.9% efficiency at .5 microns and has over twice the surface area of the Oneida filter. Cheers, Don
In order to select an air cleaner that effectively filters viruses from the air, choose: 1) a unit that is the right size for the space you will be using it in (this is typically indicated by the manufacturer in square feet), 2) a unit that has a high CADR for smoke (vs. pollen or dust), is designated a HEPA unit, or specifically indicates that

Unlike home air filters for an HVAC system, highly efficient HEPA air filters work very well in a standalone air purifier. A HEPA air filter traps 99.97% of particles in the air. Like the MERV 13 air filter, particles as small as 0.3 micron are trapped by a HEPA air filter. There is one thing to be mindful of though.

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Highly efficient devices called HEPA filters (right) successfully remove coronavirus particles from the air. Credit: Getty. Research at a hospital swamped by people with COVID-19 has confirmed

HEPA filters typically remove 0.3 μm test particles with an efficiency of at least 99.97% including most microorganisms, from the airstream. Membrane filters Porosities of membrane filters range from 0.1μm to 10μm and the most commonly used membrane filter has the pore size of 0.22μm and 0.45μm.
Generally, there are 6 common types of HVAC filters: Air Conditioner Filter. Media Air Filter. Pleated Air Filter. Bag Air Filter. Electrostatic Air Filter. HEPA Filter. These 6 types of HVAC filters are sorted according to their efficiency with number one being the lowest and number six being the highest.
A HEPA filter is standardized at a minimum 99.97% efficiency rating for removing particles greater than or equal to 0.3μm (1/83,000 of an inch) in diameter. This means that for every 10,000 particles that are 0.3μm in diameter, 3 will pass through the filter, and the rest will be trapped by the filter. This air purifier uses a 3-stage filtration technology consisting of a pre-filter, a NanoProtect HEPA filter, and an activated carbon filter. The Philips Series 800 improved air quality by approximately 93% in a performance test in a 194 sq. ft. room, which is a fantastic result. Philips provides a 2-year warranty on this model.
ULPA filters trap more and smaller particulate matter than HEPA filters. ULPA filters are 99.999% effective at removing submicron particulate matter of 0.12-micron diameter or larger, while HEPA filters are 99.97% effective for eliminating particulate matter of 0.3-micron diameter or larger. HEPA filters can be combined with pre filters to trap
The air filters are rated by a MERV standard 138 and European standard, 139 which rate filters from 1 to 20 in terms of their degree of efficiency (see Table 10.1).At the high end, MERV 17–20-rated HEPA filters are typically used in situations that require absolute cleanliness for the manufacture of microchips, liquid crystal display screens, pharmaceutical production, and microsurgery in
Claim 1: The Filter on Front “Protects” The Fan. This is probably the best reason I’ve heard. Yes, putting the filter behind the fan will prevent dust from hitting the motor and collecting on it. I think there’s a small, non-zero benefit of that, although I haven’t seen anyone actually test it.

True HEPA filter (99.98% efficiency for particles down to 0.2 microns) that targets tiny particles. Activated Carbon filter: it is built-in into the HEPA-filter and has a honeycomb-type layer with activated carbon pellets to reduce household odors (smoke, kitchen smells, pets, etc.). What immediately caught my eyes is the lack of a pre-filter.

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    • nano filter vs hepa filter