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What is a medical grade hepa filter

HEPA filters known as High-Efficiency Particulate Arrestance filters were originally developed to filter fine radioactive particles. A HEPA filter will filter with a minimum efficiency 99.97% of particles 0.3 microns and 95% of particles 0.1 microns. With 1 micron measuring just 1/10,000 of a centimeter and the smallest particle visible to the naked eye being 40 microns. 0.3 microns is many times smaller than dust mites, mold spores, pet allergens and pollens. HEPA filters are widely used in medical applications including: clean rooms, pharmaceutical manufacturing, and any environment where clean or sterile conditions are required. 

Medical grade HEPA filters are made from highly efficient filter paper. The paper is folded in a concertina configuration to maximize the surface area of the filter and allow air to flow through with minimal resistance. There is a certain ratio of filter paper to airflow volume which must be followed in the construction of the filter to achieve the 99.97% efficiency rating. If there is not enough filter paper, efficiency will not be to HEPA standards.




certified 0.003 First, a steel filter casing encapsulates an airtight bonded filter paper. While HEPA filters cannot be cleaned or even vacuumed due to their delicate nature, they are designed to last three or more years with proper pre-filtration in place. The external face may also feature a gasket or other type of airtight seal to ensure no air is allowed to bypass the filter itself during operation.

Why is a gasket necessary? Improper seals or those made of cardboard, paper, plastic or otherwise inferior materials can allow air to bypass the filter, resulting in the efficiency being much less than the stated percentage. This is not the case with AussieAir© HEPA air purifiers, which are factory-certified to filter 99.97% at 0.3 microns.

NB: Note that the majority of air purification systems sold do not rate to the high HEPA medical-grade standard. No regulatory authority is in place to monitor manufacturers of these products, either in purification or vacuum cleaners.



Most people purchase air purifiers to remove dust and allergens from the air and want the highest level of efficiency available. Medical-grade HEPA filters offer the highest level of efficiency: a minimum capture of 99.97% of particles at 0.3 microns in size and larger. With 1 micron measuring just 1/10,000 of a centimeter HEPA filters will remove dust mites, mold spores, pet allergens, pollen and ultra fine particles from the air.

Medical-grade HEPA filers are made from a very fine paper (not polypropylene or synthetic materials) which traps microscopic particles so fine they will even remove bacteria and viruses. This is why HEPA filters are used in hospital and medical applications, including operating theaters.

With the rise in popularity of HEPA vacuum cleaners and air purifiers, many manufacturers are claiming to use HEPA filters, however the majority of these are not Medical-grade and when tested, fail to filter 99.97% @ 0.3 microns of particles from the air. If you suffer from allergies or asthma it is critical to use an air purifier with a medical-grade HEPA filter.

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