HEPA is stands for High eff ency particulate filters & its normally stops particles size more than 0.3micron & using for clean rooms . Micro filtration have higher filtration level with respect to HEPA around 5 micron .All filters are using on demand on area filtration level
If you are referring to the dyson airblade, then it appears it may actually be more sanitary than paper towels. The airblade uses a HEPA filtration system, so it only blows clean air, and you dont have to touch anything, like the paper towel dispenser.
Screen filters are generally made of a (metal) mesh of some sort, their filtration grade is course, collecting large particles, typically a few millimetres (sometime perhaps 1/10th of a mm) in size or greater. Whilst paper filters are normally based on paper fibres combined together to form a very fine filter material, capable of filtering particles that are sub-micron (less than a 1/1000th of a mm) in size. Most HEPA filters for example are paper-based filters.
There are several options:Particulate filters (bag houses, HEPA, etc.)Electrostatic precipitatorsScrubbersCyclonesImpingement systemsChemical absorption
Screen filters and paper filters are alike
Many brands and types of lightweight vacuum cleaners with HEPA filtration are available in the market; Samsung 5490M, Miele S168, Upright, Dirt Devil Dynamite , Backpack 4-state HEPA Cleaner, HALO, Dyson are some brands of vacuum cleaners with HEPA filtration sold in the market. the best of all Aerus electrolux with 99,99 filter all the rest have efficiencefrrom 15% to 45%
Hepa Vacuum Cleaner - the Kenmore Progressive Canister Vacuum Cleaner with HEPA Filtration sells for $299.99 at Sears. It has a three and one half star rating in its reviews.
http://ezinearticles.com/?What-Are-HEPA-Air-Filtration-Systems?&id=1371241
a hepa filter will prevent dust and other allergens getting back into the air and makes cleaning a breeze.
Brita makes custom filtration systems designed for those with allergies. You can contact a local Brita dealer for a quote. The best air filtration systems are the HEPA filter systems. HEPA filters filter out fine particulates out of the air which include allergens.
Hepa vacuums offer extra filtering so that allergens aren't released back into the air. Dyson is one of the top makers of vacuums that offer hepa filtration.
Probably just their positioning in the filtration system, being the last part of the filter system before the air is expelled into the environment. Most modern vacuum cleaners for example, have what is known as terminal filters, which are the last mechanism for trapping particles from the motor, or dust not previously filtered by the previous separation devices throughout the cleaner.
Most of the allergens are in the air. The best thing to do is to get a hepa filtration system.
The difference is the A one has the word PET in the name and is blue while the B one does not have the word pet in the description/name. I think they otherwise are the exact same thing. The 1200A has a 32 ou. collection capacity, the 1200B only a 15 ou. plus the 1200A has Microban filtration (HEPA?).
A Hepa Air Purifier uses a specialized Hepa filter to clean dust, contaminants, and allergans from the air, while an Ammonia Air Purifier uses chemical mechanisms to remove amines and ammonias from the air.
having pore size 0.3 micron
The most important specifications of air purifiers are the air filters. Today, there are two major types of filters that are used in modern air purifiers and ionizers. People often do not know the difference between a HEPA and HEPA type filter. A true HEPA filter captures more than 99.7 percent of common air allergens. A HEPA type filter captures less allergens, which could be as low as 85 percent. In some air purifiers, there are permanent air filters that only need to be washed or vacuumed. This eliminates the costs associated with replacing the traditional filters every several months.