ULPA grade HEPA filter" is a commonly used phrase when referring to ULPA filters. In reality, ULPA and HEPA are two different types of filters. They are identical in appearance but ULPA filters are capable of capturing particles much smaller in size, at an efficiency rate 10 times greater than HEPA filters. The generic name "ULPA" stands for "Ultra Low Penetration Air" filter. ULPA filters are tested and rated to remove particles .12 micron in size and larger, at an efficiency of 99.9995%.

HEPA (High-Efficiency Particulate Aerosol) - HEPA filter has a minimum particle collection efficiency of 99.97% for particles 0.3 microns in diameter. ULPA (Ultra Low Penetration Aerosol) - ULPA filter has an efficiency of 99.999% for particles in the most penetrating particle size at the specified media velocity. The most penetrating particle size is the particle diameter when penetration through the media is highest. SULPA (Super ULPA) – At an efficiency of 99. See similar questions...

ULPA filters otherwise known as Ultra-HEPA filters are the next level of air purification efficiency up from HEPA filters trapping 99.999% of air particles 0.3 microns and less from the passing air including smoke, pollen and dust. See similar questions...

High-Efficiency Particulate Air filters (HEPA) are a type of media filter that is very tightly woven. This unique filter was initially developed during World War II to prevent discharge of airborne radioactive particles from the exhaust of nuclear reactors. HEPA filters have since become the Gold standard technology in purifying the air in industrial, medical, and military settings. HEPA filters are now the most popular choice for portable residential air cleaners. See similar questions...

The HEPA (High Efficiency Particle Arresting) filter was developed by the US Atomic Energy Commission to filter out sub-micron particles. All True Medical HEPA is laser-tested and must remove a minimum of 99.97% of all particulate matter greater than 0.3 microns in size. A human hair is about 300 times too large to penetrate a HEPA filter. See similar questions...

Not necessarily. Look for vacuums carrying the CRI vacuum cleaner testing program label. Many units are not HEPA filter units, yet are very effective in dust containment. HEPA filters may add additional cost to the overall operational cost of the vacuum. No seam is invisible, seams should be kept to a minimum, running the length of the area making sure the natural light does not strike across the seam. See similar questions...

The problem there is that they can only clean the air that actually passes through the filter, so they can only purify a portion of the air in a single room. However, most of the airborne particles in a single room will not line up single file and pass through a stationary filter, let alone an entire home. They also cause noise pollution, waste hundreds of dollars a year in electricity, are limited to collecting particles over .30 microns, and feature costly replacement filters. See similar questions...

Call a professional to assess the problem. and use a true air purifier to trap the mold spores so the mold will not grow. It is impossible to get rid of all mold and mold spores indoors; some mold spores will be found floating through the air and in house dust. The mold spores will not grow if moisture is not present. Indoor mold growth can and should be prevented or controlled by controlling moisture indoors. See similar questions...

The difference is huge. According to the American Lung Association, the efficiency of HEPA-type filters "may be 55% or less at 0.3 microns," which means that at least 4,500 out of 10,000 0.3 micron particles will pass through. The true medical grade HEPA (High Efficiency Particulate Air) filters, like those used in the CAP600 & CAP1200 models, are certified to a minimum efficiency of 99.97% at 0.3 microns. See similar questions...

Assuming normal indoor environmental conditions and average usage of eight hours per day, your HEPA filter should last about a year. See similar questions...

HEPA stands for High Efficiency Particulate Arresting. These filters were designed in the 1950s by the US Atomic Energy Commission to remove radioactive particulates from the air. These filters consist of tightly bound fibers that work to "catch" particles as air is passed through the filter. HEPA filters use an accordion-like or folded structure to increase surface area, thus allowing them to capture more particles and extend the life of the filter. See similar questions...