Air filtration - Revision history

Designing Buildings at 08:30, 2 August 2022

2022-08-02T08:30:40Z

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	= External resources =		= External resources =

		+	* [https://www.bsria.com/uk/product/WrmJxn/illustrated_guide_to_ventilation_bg_22009_a15d25e1/ Illustrated Guide to Ventilation (BG 2/2009)], compiled by Kevin Pennycook and published by BSRIA in 2009.
	* American Society of Heating and Air-conditioning Engineers (ASHRAE), [https://www.ashrae.org/File%20Library/About/Position%20Documents/filtration-and-air-cleaning-pd-Feb.2.2021.pdf ASHRAE Position Document on Filtration and Air Cleaning].		* American Society of Heating and Air-conditioning Engineers (ASHRAE), [https://www.ashrae.org/File%20Library/About/Position%20Documents/filtration-and-air-cleaning-pd-Feb.2.2021.pdf ASHRAE Position Document on Filtration and Air Cleaning].
	* UK Scientific Advisory Group for Emergencies, Environmental and Modelling Group (SAGE-EMG), [https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/939173/S0867_EMG_Potential_application_of_air_cleaning_devices_and_personal_decontamination_to_manage_transmission_of_COVID-19.pdf Potential application of Air Cleaning devices and personal decontamination to manage transmission of COVID-19].		* UK Scientific Advisory Group for Emergencies, Environmental and Modelling Group (SAGE-EMG), [https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/939173/S0867_EMG_Potential_application_of_air_cleaning_devices_and_personal_decontamination_to_manage_transmission_of_COVID-19.pdf Potential application of Air Cleaning devices and personal decontamination to manage transmission of COVID-19].

Designing Buildings at 08:30, 2 August 2022

2022-08-02T08:30:13Z

← Older revision		Revision as of 08:30, 2 August 2022
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	* Ultraviolet (UV-C) germicidal irradiation (UVGI). This air cleaning technique uses ultraviolet light to treat viruses, bacteria and fungi by degrading organic material in the airstream. This does not remove the contaminants - it merely deactivates them. This technique can be used inside HVAC systems or can be used as a portable air cleaning device. It is also used in some swimming pools.		* Ultraviolet (UV-C) germicidal irradiation (UVGI). This air cleaning technique uses ultraviolet light to treat viruses, bacteria and fungi by degrading organic material in the airstream. This does not remove the contaminants - it merely deactivates them. This technique can be used inside HVAC systems or can be used as a portable air cleaning device. It is also used in some swimming pools.
	* There are also combination air cleaning packages that incorporate multiple air filtration approaches. These technologies may be portable with several types of filters as well as fans.		* There are also combination air cleaning packages that incorporate multiple air filtration approaches. These technologies may be portable with several types of filters as well as fans.
		+
		+	See also: Types of air filter.

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =
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	* Let us evolve our buildings from being passive structures to interactive and reactive systems.		* Let us evolve our buildings from being passive structures to interactive and reactive systems.
	* Minimum efficiency reporting value MERV.		* Minimum efficiency reporting value MERV.
		+	* Types of air filter.
	* Ventilation and control of COVID-19 transmission.		* Ventilation and control of COVID-19 transmission.

Editor at 18:33, 14 January 2022

2022-01-14T18:33:13Z

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	* Growing focus on IAQ challenges for specifiers and HVAC manufacturers.		* Growing focus on IAQ challenges for specifiers and HVAC manufacturers.
	* Heating ventilation and air conditioning HVAC.		* Heating ventilation and air conditioning HVAC.
		+	* High efficiency particulate arrestance HEPA.
	* Indoor air quality.		* Indoor air quality.
	* Let us evolve our buildings from being passive structures to interactive and reactive systems.		* Let us evolve our buildings from being passive structures to interactive and reactive systems.

Editor at 13:06, 5 January 2022

2022-01-05T13:06:55Z

← Older revision		Revision as of 13:06, 5 January 2022
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	* Heating ventilation and air conditioning HVAC.		* Heating ventilation and air conditioning HVAC.
	* Indoor air quality.		* Indoor air quality.
		+	* Let us evolve our buildings from being passive structures to interactive and reactive systems.
	* Minimum efficiency reporting value MERV.		* Minimum efficiency reporting value MERV.
	* Ventilation and control of COVID-19 transmission.		* Ventilation and control of COVID-19 transmission.

Editor at 19:00, 17 December 2021

2021-12-17T19:00:41Z

← Older revision		Revision as of 19:00, 17 December 2021
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	* Arrestance.		* Arrestance.
	* Building regulations.		* Building regulations.
		+	* Clean air delivery rate CADR.
	* Clean indoor air for healthy living - New air filter standards.		* Clean indoor air for healthy living - New air filter standards.
	* Designing HVAC to resist harmful microorganisms.		* Designing HVAC to resist harmful microorganisms.

Designing Buildings at 08:58, 15 December 2021

2021-12-15T08:58:34Z

← Older revision		Revision as of 08:58, 15 December 2021
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	= Introduction =		= Introduction =

−	The process of air filtration ~~can be defined as a form of air cleaning that~~ uses filters to capture and remove particles from the air.	+	The process of air filtration uses filters to capture and remove particles from the air.

−	~~= Air~~ filtration and HVAC =	+	The purpose of air filtration is to reduce contaminants from entering buildings (or parts of buildings) and to improve indoor air quality (IAQ) and airborne hygiene levels. Certain types of air filtration technology can be incorporated directly into heating ventilation and air conditioning (HVAC) systems to remove contaminants from outdoor air that has been brought for ventilation.

−	~~The purpose of~~ air filtration is to reduce ~~contaminants from entering air handling systems and improve indoor air quality (IAQ) and airborne hygiene levels inside buildings. Certain types~~ of air ~~filtration technology can~~ be ~~incorporated directly into heating ventilation and~~ air ~~conditioning (HVAC) systems and used to remove contaminants from outdoor~~ air ~~that has~~ been ~~brought in as ventilation~~.	+	In some cases, air filtration is used to reduce the amount of outdoor air that may be required for ventilations by recirculating internal air mixed with some 'fresh' air. However, as a result of the COVID-19 pandemic, recommendations regarding recirculation have been changed.

−	~~In some cases, air filtration is also used to reduce~~ the ~~amount~~ of ~~outdoor air ventilation that may be required. However,~~ air filtration ~~and ventilation are not synonymous - nor does one replace the other. As a result of the 2020/2021 COVID-19 pandemic, recommendations regarding the reduction of outdoor air levels have been affected~~.	+	The type of contaminant being captured will influence the suitability of different air filtration systems.

	= Air filters for buildings =		= Air filters for buildings =

−	~~The type of contaminant being captured will influence~~ the ~~suitability of different~~ air ~~filtration systems~~. ~~Certain~~ types of ~~contaminants can be removed by~~ a ~~physical air filter~~.	+	Air filters are systems or components that remove particulates from the air as it passes through filtering elements. Some of the most common types of filtering elements include fabric (those made from woven and felted fabrics that are used to collect particles on their surface) and fibrous (those fabricated out of a mat of non-woven fibres such as fibreglass and various polymers; these are then incorporated into filters that collect particles throughout their structure).

−	Air filters are systems or components that remove particulates from the air as it passes through filtering elements. Some of the most common types of filtering elements include fabric (those made from woven and felted fabrics that are used to collect particles on their surface) and fibrous (those fabricated out of a mat of nonwoven fibres made from materials such as fibreglass and various polymers; these are then incorporated into filters that collect particles throughout their structure).	+	Other types of contaminants require transformation (into harmless substances) through a process of a chemical reaction, or processes such as the application of ultraviolet light. In some instances, electrostatic attraction and gravitational settling may also contribute to particle capture.
−		+
−	Other types of contaminants require transformation (into harmless substances) through ~~the~~ process of a chemical reaction. In some instances, electrostatic attraction and gravitational settling may also contribute to particle capture.	+

	= Types of air filtration systems =		= Types of air filtration systems =

−	~~The most common~~ types of air filtration systems include:	+	Common types of air filtration systems include:

	* Mechanical and electronic air filters. These devices remove particles by generating electrical fields and/or ions and passing the charged air through a filtering agent (also known as filter media). Some filters use a static electrical charge to increase collection and removal of particles. In large systems, the measurement of particles removed may be referred to as particle removal efficiency, filter efficiency or single-pass efficiency based on the minimum efficiency reporting value (MERV). In portable systems, the measurement is referred to as the clean air delivery rate (CADR).		* Mechanical and electronic air filters. These devices remove particles by generating electrical fields and/or ions and passing the charged air through a filtering agent (also known as filter media). Some filters use a static electrical charge to increase collection and removal of particles. In large systems, the measurement of particles removed may be referred to as particle removal efficiency, filter efficiency or single-pass efficiency based on the minimum efficiency reporting value (MERV). In portable systems, the measurement is referred to as the clean air delivery rate (CADR).
	* Sorbent air cleaners. Sorbent air cleaners are primarily used to remove harmful gaseous contaminants from airstreams. They use a process that involves physical adsorption (with materials such as activated carbon) along with chemisorption. There is frequently a combination of different types of air filtration systems in place when sorbent air cleaning is used.		* Sorbent air cleaners. Sorbent air cleaners are primarily used to remove harmful gaseous contaminants from airstreams. They use a process that involves physical adsorption (with materials such as activated carbon) along with chemisorption. There is frequently a combination of different types of air filtration systems in place when sorbent air cleaning is used.
−	* Photocatalytic oxidation (PCO) air cleaners. This ~~process refers to~~ a reaction between gases and biological particles on certain semiconductor or photocatalyst materials such as TiO2 (titanium dioxide). The addition of ~~certain~~ other substances may improve the performance of photocatalysts, and various ultraviolet light sources may also be used in this process.	+	* Photocatalytic oxidation (PCO) air cleaners. This is a reaction between gases and biological particles on certain semiconductor or photocatalyst materials such as TiO2 (titanium dioxide). The addition of other substances may improve the performance of photocatalysts, and various ultraviolet light sources may also be used in this process.
−	* Ultraviolet (UV-C) germicidal irradiation (UVGI). This air cleaning technique uses ~~short-wave~~ ultraviolet ~~energy~~ to treat viruses, bacteria and fungi by degrading organic material in the airstream. This does not remove the contaminants - it merely deactivates them. This technique can be used inside HVAC systems or can be used as a portable air cleaning device.	+	* Ultraviolet (UV-C) germicidal irradiation (UVGI). This air cleaning technique uses ultraviolet light to treat viruses, bacteria and fungi by degrading organic material in the airstream. This does not remove the contaminants - it merely deactivates them. This technique can be used inside HVAC systems or can be used as a portable air cleaning device. It is also used in some swimming pools.
−		+	* There are also combination air cleaning packages that incorporate multiple air filtration approaches. These technologies may be portable with several types of filters as well as fans.
−	~~= Combination air filtration technologies =~~	+
−		+
−	There are also combination air cleaning packages that incorporate multiple air filtration approaches. These technologies may be portable.	+
−		+
−	~~They tend to have~~ several types of filters as well as fans ~~and are not typically suitable for commercial settings. They may also be referred to as domestic air purifiers~~.	+

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =

Editor at 09:26, 14 December 2021

2021-12-14T09:26:21Z

← Older revision		Revision as of 09:26, 14 December 2021
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	* American Society of Heating and Air-conditioning Engineers (ASHRAE), [https://www.ashrae.org/File%20Library/About/Position%20Documents/filtration-and-air-cleaning-pd-Feb.2.2021.pdf ASHRAE Position Document on Filtration and Air Cleaning].		* American Society of Heating and Air-conditioning Engineers (ASHRAE), [https://www.ashrae.org/File%20Library/About/Position%20Documents/filtration-and-air-cleaning-pd-Feb.2.2021.pdf ASHRAE Position Document on Filtration and Air Cleaning].
−	* SAGE-EMG, [https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/939173/S0867_EMG_Potential_application_of_air_cleaning_devices_and_personal_decontamination_to_manage_transmission_of_COVID-19.pdf Potential application of Air Cleaning devices and personal decontamination to manage transmission of COVID-19].	+	* UK Scientific Advisory Group for Emergencies, Environmental and Modelling Group (SAGE-EMG), [https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/939173/S0867_EMG_Potential_application_of_air_cleaning_devices_and_personal_decontamination_to_manage_transmission_of_COVID-19.pdf Potential application of Air Cleaning devices and personal decontamination to manage transmission of COVID-19].
	* Science Direct, [https://www.sciencedirect.com/topics/engineering/air-filtration Assessing Nanoparticle Risks to Human Health] by Peter C Raynor.		* Science Direct, [https://www.sciencedirect.com/topics/engineering/air-filtration Assessing Nanoparticle Risks to Human Health] by Peter C Raynor.

	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Definitions]] [[Category:Products_/_components]]		[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Definitions]] [[Category:Products_/_components]]

Editor at 09:24, 14 December 2021

2021-12-14T09:24:44Z

Editor at 19:06, 13 December 2021

2021-12-13T19:06:49Z

← Older revision		Revision as of 19:06, 13 December 2021
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	* Indoor air quality.		* Indoor air quality.
	* Minimum efficiency reporting value MERV.		* Minimum efficiency reporting value MERV.
		+	* Ventilation and control of COVID-19 transmission.

	= External resources =		= External resources =

Editor at 19:02, 13 December 2021

2021-12-13T19:02:36Z

← Older revision		Revision as of 19:02, 13 December 2021
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	* Air filtration and clean indoor air quality standards.		* Air filtration and clean indoor air quality standards.
−	* Air permeability.
	* American Society of Heating and Air-conditioning Engineers.		* American Society of Heating and Air-conditioning Engineers.
	* Arrestance.		* Arrestance.
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	* SAGE-EMG, [https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/939173/S0867_EMG_Potential_application_of_air_cleaning_devices_and_personal_decontamination_to_manage_transmission_of_COVID-19.pdf Potential application of Air Cleaning devices and personal decontamination to manage transmission of COVID-19].		* SAGE-EMG, [https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/939173/S0867_EMG_Potential_application_of_air_cleaning_devices_and_personal_decontamination_to_manage_transmission_of_COVID-19.pdf Potential application of Air Cleaning devices and personal decontamination to manage transmission of COVID-19].
	* Science Direct, [https://www.sciencedirect.com/topics/engineering/air-filtration Assessing Nanoparticle Risks to Human Health] by Peter C. Raynor.		* Science Direct, [https://www.sciencedirect.com/topics/engineering/air-filtration Assessing Nanoparticle Risks to Human Health] by Peter C. Raynor.
		+
		+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Definitions]] [[Category:Products_/_components]]

← Older revision		Revision as of 09:24, 14 December 2021
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	The type of contaminant being captured will influence the suitability of different air filtration systems. Certain types of contaminants can be removed by a physical air filter.		The type of contaminant being captured will influence the suitability of different air filtration systems. Certain types of contaminants can be removed by a physical air filter.

−	Air filters are systems or components that remove particulates from the air as it passes through filtering elements. Some of the most common types of filtering elements include fabric (those made from woven and felted fabrics that are used to collect particles on their surface) and fibrous (those ~~made~~ out of a mat of nonwoven fibres ~~made~~ made from materials such as fibreglass and various polymers ~~and~~ incorporated into filters that collect particles throughout their structure).	+	Air filters are systems or components that remove particulates from the air as it passes through filtering elements. Some of the most common types of filtering elements include fabric (those made from woven and felted fabrics that are used to collect particles on their surface) and fibrous (those fabricated out of a mat of nonwoven fibres made from materials such as fibreglass and various polymers; these are then incorporated into filters that collect particles throughout their structure).

−	Other types of contaminants require transformation (into a harmless ~~substance~~) through the process of a chemical reaction.In some instances, electrostatic attraction and gravitational settling may also contribute to particle capture.	+	Other types of contaminants require transformation (into harmless substances) through the process of a chemical reaction. In some instances, electrostatic attraction and gravitational settling may also contribute to particle capture.

	= Types of air filtration systems =		= Types of air filtration systems =
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	* Mechanical and electronic air filters. These devices remove particles by generating electrical fields and/or ions and passing the charged air through a filtering agent (also known as filter media). Some filters use a static electrical charge to increase collection and removal of particles. In large systems, the measurement of particles removed may be referred to as particle removal efficiency, filter efficiency or single-pass efficiency based on the minimum efficiency reporting value (MERV). In portable systems, the measurement is referred to as the clean air delivery rate (CADR).		* Mechanical and electronic air filters. These devices remove particles by generating electrical fields and/or ions and passing the charged air through a filtering agent (also known as filter media). Some filters use a static electrical charge to increase collection and removal of particles. In large systems, the measurement of particles removed may be referred to as particle removal efficiency, filter efficiency or single-pass efficiency based on the minimum efficiency reporting value (MERV). In portable systems, the measurement is referred to as the clean air delivery rate (CADR).
−	* Sorbent air cleaners. Sorbent air cleaners are primarily used to remove harmful gaseous contaminants from airstreams. They use a process that involves physical adsorption with materials such as activated carbon along with chemisorption. There is frequently a combination of air filtration systems in place when sorbent air cleaning is used.	+	* Sorbent air cleaners. Sorbent air cleaners are primarily used to remove harmful gaseous contaminants from airstreams. They use a process that involves physical adsorption (with materials such as activated carbon) along with chemisorption. There is frequently a combination of different types of air filtration systems in place when sorbent air cleaning is used.
−	* Photocatalytic oxidation (PCO) air cleaners. This process refers to a reaction between gases and biological particles on certain semiconductor or photocatalyst materials such as TiO2 (titanium dioxide). ~~Some~~ substances may improve the performance of photocatalysts, and various ultraviolet light sources may also be used in this process.	+	* Photocatalytic oxidation (PCO) air cleaners. This process refers to a reaction between gases and biological particles on certain semiconductor or photocatalyst materials such as TiO2 (titanium dioxide). The addition of certain other substances may improve the performance of photocatalysts, and various ultraviolet light sources may also be used in this process.
	* Ultraviolet (UV-C) germicidal irradiation (UVGI). This air cleaning technique uses short-wave ultraviolet energy to treat viruses, bacteria and fungi by degrading organic material in the airstream. This does not remove the contaminants - it merely deactivates them. This technique can be used inside HVAC systems or can be used as a portable air cleaning device.		* Ultraviolet (UV-C) germicidal irradiation (UVGI). This air cleaning technique uses short-wave ultraviolet energy to treat viruses, bacteria and fungi by degrading organic material in the airstream. This does not remove the contaminants - it merely deactivates them. This technique can be used inside HVAC systems or can be used as a portable air cleaning device.

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	There are also combination air cleaning packages that incorporate multiple air filtration approaches. These technologies may be portable.		There are also combination air cleaning packages that incorporate multiple air filtration approaches. These technologies may be portable.

−	They tend to have several types of filters as well as fans and are not suitable for commercial settings. They may also be referred to as domestic air purifiers.	+	They tend to have several types of filters as well as fans and are not typically suitable for commercial settings. They may also be referred to as domestic air purifiers.

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =
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	* American Society of Heating and Air-conditioning Engineers (ASHRAE), [https://www.ashrae.org/File%20Library/About/Position%20Documents/filtration-and-air-cleaning-pd-Feb.2.2021.pdf ASHRAE Position Document on Filtration and Air Cleaning].		* American Society of Heating and Air-conditioning Engineers (ASHRAE), [https://www.ashrae.org/File%20Library/About/Position%20Documents/filtration-and-air-cleaning-pd-Feb.2.2021.pdf ASHRAE Position Document on Filtration and Air Cleaning].
	* SAGE-EMG, [https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/939173/S0867_EMG_Potential_application_of_air_cleaning_devices_and_personal_decontamination_to_manage_transmission_of_COVID-19.pdf Potential application of Air Cleaning devices and personal decontamination to manage transmission of COVID-19].		* SAGE-EMG, [https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/939173/S0867_EMG_Potential_application_of_air_cleaning_devices_and_personal_decontamination_to_manage_transmission_of_COVID-19.pdf Potential application of Air Cleaning devices and personal decontamination to manage transmission of COVID-19].
−	* Science Direct, [https://www.sciencedirect.com/topics/engineering/air-filtration Assessing Nanoparticle Risks to Human Health] by Peter C. Raynor.	+	* Science Direct, [https://www.sciencedirect.com/topics/engineering/air-filtration Assessing Nanoparticle Risks to Human Health] by Peter C Raynor.

	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Definitions]] [[Category:Products_/_components]]		[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Definitions]] [[Category:Products_/_components]]