The HEPA Filter is the heart of the biosafety cabinet and consists of an arbitrarily arranged mat of fibers. Microscale diameter is measured. This size of the particle is the most difficult to filter and is, therefore, the particle size considered to be the most permeable. Next, we take a look at the history, principles, and features of the HEPA Filter. Here are some answers.

Here is the content list:

l Product history of the HEPA Filter.

l The principle of the HEPA Filter is explained.

l Performance features of the HEPA Filter.

Product history of the HEPA Filter.

The original HEPA filter was designed in the 1940s and used in the Manhattan Project to prevent the spread of airborne radioactive contaminants. It was commercialized in the 1950s and became a registered trademark and a general term for a very efficient filter. In the decade filters evolved to meet the higher and higher demand for air quality in a variety of high technology industries such as aerospace, pharmaceutical processing, hospitals, healthcare, nuclear fuel, nuclear energy, and computer chips.

The United States Department of Energy (DOE) has specific requirements for HEPA Filters in applications regulated by the DOE. Products labeled as "HEPA Type", "HEPA" or "99% HEPA" may not meet these requirements in independent laboratories and may not be tested.

The principle of the HEPA Filter is explained.

The interior of the HEPA Filter housing consists of a coarse filter, a fine filter, a suction tube, a stainless steel brush or stainless steel nozzle, a seal, a corrosion protection coating, and a rotating shaft. After the equipment has been installed, a technician carries out the commissioning, sets the filtering time and the cleaning conversion time and the HEPA Filter starts to work normally. The water to be treated by the filter enters the body through the water inlet and the impurities in the water are deposited on the stainless steel screen, resulting in differential pressure. When the differential pressure reaches the set value, the electric controller signals the hydraulic control valve and drive motor, triggering the following actions: the motor drives the brush to rotate and clean the filter element, the control valve opens for discharge, and the whole cleaning process lasts only tens of seconds. The system returns to its initial state and starts the next filtration process.

Performance features of the HEPA Filter.

The HEPA filter has a filtration efficiency of 99.97% or more for particles ≥0.3μm. The HEPA Filter is folded with a computer-controlled, fully automatic folding machine system that can be adjusted steplessly from 22 to 96mm. The HEPA Filter is designed to remove a wide range of airborne contaminants including standard dust, cigarette smoke bacteria (bacteria size: 500 to 0.3 microns), soot, pollen, radioactive particles), soot pollen radioactive particles impurities ions, etc.