This is an excerpt from a published technical article entitled "Air Filtration and Its Practical Application in the Hospital Environment", which was written by Kristian Kirwin (B.ENG Mechanical) and Shannon Roger (B.Ed) for Airepure Australia (a company Camfil Group of Companies) and published in Healthcare Facilities Volume 41, Issue 3, September 2018.
For detailed information on filtration mechanism, filtration performance, filter efficiency/grade/standard, hospital filtration requirements, filter maintenance and testing, please refer to https://www.airepure.com.au/air-filters-for-hospitals- and-health care facilities/.
Metal frame flat filter (20-25 mm deep G4)
The flat filter is the most basic type of air filter, in which a flat air filter medium is enclosed in a metal frame. Usually used as pre-filters for terminal-mounted exhaust HEPA enclosures in hospital applications, where the pre-filtering space is limited (such as the suite area of the isolation room), they are used to protect the HEPA filter and prevent large particles from entering the system.
Cardboard pleated filter (100 mm deep G4–F7)
Cardboard disposable filters consist of pleated air filter media glued to a cardboard frame (usually moisture-proof beverage grade cardboard). Includes diagonal cardboard supports across the surface of the filter to improve rigidity and durability. It is usually used as a pre-filter in a series closed exhaust filter system in hospital applications, where there is enough space for a higher-level, high-capacity pre-filter to protect the high-capacity HEPA filter.
Glass fiber pleated panel filter (100 mm deep F8–F9)
The glass fiber pleated plate filter is composed of paper-like micro glass fiber media, forming tightly spaced pleated bags, and glued to the cardboard frame (usually moisture-proof beverage grade cardboard). Suitable for variable air volume systems or turbulent conditions, they usually provide high pressure for a given airflow. Usually used as the final filter in the FCU in hospital applications, space is very precious due to size and media limitations.
Multi-bag filter (380 mm deep F8/F9)
The multi-bag filter consists of six bags/eight bags (full size) or three bags/four bags (half size) deep bed bags and consists of electrostatic filter media bonded to a metal head frame, usually with excellent pollution Material retention and reasonable stress resistance. They are bulky and require quite long pipes to contain them. Commonly used in hospital AHU.
Rigid/mixed media filter (100 mm deep F8/F9)
The rigid molded mixed media filter is composed of a self-supporting layered filter medium, which uniquely combines a pre-filter layer, a middle filter layer and a fine filter layer, and is bonded to a metal frame. These filters have excellent pollutant retention capacity and reasonable pressure resistance-especially for high efficiency grades. In hospital applications, these filters are chosen to replace glass fiber pleated panel filters as the final filters in limited space locations (beds or FCUs in specific locations).
The HEPA filter is composed of fine pleated air filter media with high surface area characteristics, which can achieve high-efficiency filtration. It is usually manufactured with the highest quality materials under strict quality control conditions, and is factory certified to ensure that the filtration performance meets the EN 1822:2009 standard .
Special separator and corrugated/non-separator HEPA filters have been factory tested and meet the requirements of IEST RP-CC001.3 for A, B, C, D, E or F filters (industrial grade, nuclear grade), Laminar flow level, biological/hazard level, VLSI, ULPA or pharmaceutical level); and can pass UL586 or UL900 standard certification.
The mini-pleated HEPA filter is made of paper-like micro glass fiber media, forming tightly spaced pleated packs, which are separated by a continuous thermoplastic rope and bonded to a metal frame. Typically used in every supply or exhaust HEPA enclosure in hospital applications.
Separate HEPA (H14/U15 or professional)
Separator-type HEPA filters are made of paper-like micro glass fiber media, forming tightly spaced pleated packs, which are separated by corrugated aluminum partitions and bonded to a metal frame. In hospital applications, these filters are used in i-line HEPA enclosures, HEPA enclosures mounted on AHUs, or high-efficiency exhaust BIBO (bag/bag/bag/out) air transmission containment systems.
V-shaped mini pleated HEPA (F9–H10, 95% DOP and H14)
The V-shaped mini-pleated HEPA filter is made of ultra-fine glass fiber media as thin as paper to form micro-pleated media packs that are arranged in a V-shaped bed configuration and bonded to a box-like metal frame that provides strength and high-speed applications The durability. F9–H10 and 95% DOP rated V-shaped mini-pleated HEPA filters are usually used as the final filter in the intensive care area or as the final pre-filter in the HEPA filtration area. H14 class V-shaped mini pleated HEPA filters are usually used for HEPA applications (in the supply air AHU or exhaust plenum) for high-volume pipeline installations.
Dimple folds, no partition HEPA (H14/U15-professional)
Dent pleated, separatorless HEPA filters consist of self-supporting and self-separating layered filter media glued to a metal or wooden frame. These filters are usually used in high-efficiency exhaust BIBO (bag/bag/bag/out) airborne sealing systems or nuclear medicine/cyclotron fields because of their relatively low pressure and high capacity characteristics. Depending on the application, the filter media pack and frame can be incinerated when needed.
Activated carbon filters using activated carbon filter media usually have flat plate, cardboard pleats and V-shaped mini pleats. Some filter types use mixed particulate/activated carbon media to combine particulate and gas filtration. It is often used to remove VOCs and other inorganic gases generated indoors and outdoors to improve indoor air quality. They are especially useful when outdoor air intakes are close to roads, loading docks, or helipads.
High quality carbon/chemical injection media filter
High-quality carbon or chemical injection media can be filtered through carbon/chemical media particles installed in the shell/tank. Usually used in places where a large or high percentage of gas/odor needs to be removed, these filters are usually used in animal laboratory areas and helipad areas to remove odors and spray/diesel fumes.
HEGA (High Efficiency Gas Adsorption) filter
HEGA filters are manufactured with the highest quality materials under strict quality control conditions, as a customized target high-quality carbon medium installed in the V-group housing, and are factory tested to meet the requirements of IES RP-CC-008-84. "Recommended Practice for Gas Phase Adsorption Pool". HEGA filters are usually combined with high-efficiency exhaust BIBO (bag/bag/bag/out) airborne sealing systems or HEPA filters in the radioactive distribution/cyclotron area. They are usually type tested and the media are batch tested. If necessary, field tests can be conducted to confirm performance. The first issue to consider is the handling of these filters-they are bulky and very heavy due to their structure and carbon mass.
In spite of our technological progress and awareness, there are still inequalities in the modern world...
Associate Professor Amanda Walker explained why it is time to adopt a consistent method to use...
It's time to get rid of handwritten paper journals and adopt digital technology,...
The cost of records management after the pandemic
Improved integrated design for infection control
Nursing does not have to pay a price
Mixed work and equal experience
Enmin food and beverage modular components
Pager replacement solution: unify the care team to ensure patient safety
Cutting-edge AI floor cleaning with UV-C sterilization technology
The link between gut microbiota and autism has changed drastically
Oral hookworm vaccine proved effective in mice
Rapid detection of pathogens from a single DNA molecule
Insomnia may be a risk factor for cerebral aneurysm rupture
AusBiotech announces industry excellence award, new chairman
Two companies are accused of high-pressure concrete explosion
The study outlines how mining companies can better protect workers
Welder Breathing PPE: Control Measures and Responsibilities
Metal manufacturer fined after worker severely burned
A strong safety culture: its importance during a pandemic
Arnott turns to recyclable displays
Using NIR spectroscopy to analyze the production of apple slices
Guiding indigenous jungle food companies to succeed
Spice industry in northern Australia heats up
Nestlé shrinks its packaging
Westwick-Farrow Media Locked Bag 2226 North Ryde BC NSW 1670 ABN: 22 152 305 336 www.wfmedia.com.au Email us
Hospital Healthcare provides busy hospitals, health and aged care professionals with easy-to-use, readily available sources of information, which are critical to gaining valuable industry insights. Members can access thousands of information items through various media channels.
Qualified industry professionals across Australia can obtain membership for free.