HEPA filter


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HEPA filter

[′hep·ə ‚fil·tər]
(mechanical engineering)

HEPA filter

A high efficiency particulate absolute filter capable of trapping and retaining at least 99.9% of asbestos fibers greater than 0.3 microns in length.
References in periodicals archive ?
It uses three filters, a pre-filter, a HEPA filter and a carbon filter.
Sweepers have filters that are effective at trapping some respirable dust particles, although not at the 99-plus % level as a HEPA filter. Indeed, the dirtier the filter the more effective is the fine particle capture efficiency.
In an exclusive video interview with ConstructionWeekOnline , Al Abbar said HEPA filter services are particularly important in the healthcare sector.
Beyond having a HEPA filter, managers should be aware of two issues when considering an upright:
Use of the HEPA filters reduced indoor [PM.sub.2.5] concentrations by 60%, and indoor levoglucosan levels fell by 75% on average, compared with nonuse.
Hence, the comparison in your article of a HEPA filter at 99.97% and a MERV 13 filter at 80% at 0.3 micron will not provide an accurate result in the listed formula, as the efficiency of the ASHRAE filter is not correct, and the comparison will not be relative.
An inverter with variable frequency drives was installed to examine the performance variation and energy-saving potential under different face velocity of HEPA filter. The investigated operating room with the dimension of length 6.2 m (20.3 ft), width 4.8 m (15.7 ft), and height 3.7 m (12.1 ft) respectively.
When equipped with an optional HEPA filter, this unit is said to retain 99.995% of collected ultra-fine particles, down to 0.18 microns.
This high specification is achieved by passing the air through a high efficiency HEPA filter with recirculating air giving an improved filtering effect.
The product's permanent HEPA filter never needs replacing--users simply vacuum to clean when the Filter Gauge light indicates the filter is dirty.
It also runs the incoming air through a HEPA filter to remove particulates.
For every 10,000 such particles that go into a HEPA filter, only 3 pass though, he said.