High temperature filters also often called high efficiency particulate arresting or high-efficiency particulate air, is a kind of air filter. Filters that meet HEPA standard have a lot of applications, including the application in aircrafts, homes, medical facilities and automobiles. The filter must also meet certain standards of efficiency like those defined by United States Department of Energy (DOE). In order to qualify as the HEPA by US set standards, an air filter should be able to eliminate 99.97 percent particles having size of 0.3 µ.
High temperature filters are made of up randomly arranged fibers, which are generally made up of fiberglass and hold diameters between 0.5 to 2.0 micrometers. The major aspects affecting its functions include filter thickness, fiber diameter, and face velocity. The air space in between the high temperature filter fibers is usually much bigger than o.3µm. The common assumption that a heap filter functions like a sieve where particles smaller than the biggest opening can transmit through is impractical and incorrect. Unlike membrane filters at this pore dimension, where particles are as wide as the biggest opening or distance between fibers are unable to transmit in between them at all, high temperature filters are developed to target much tiny particles and pollutants. These particles are also trapped through mechanism that consists of:
The high temperature filters’ minimal resistance to air stream or pressure drop, has been defined by DOE as around 300 pascals at its nominal flow rate. Nowadays, the high temperature filter system is applicable to any highly efficient air filter that can achieve the same filter efficiency performance standards as a minimum and is equal to more recent NIOSH N100 rating for respirator filters. These are the major technical information industrial buyers must know before choosing the best high temperature filters for their facility.