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Basics & Theory

Ecohome: Buying Guide for Furnace Filters
Ecohome says finding the right high-efficiency home air filter for furnaces & ventilation systems is essential for keeping indoor air clean, healthy & protecting us from allergens, animal dander, pollen, mold spores & maybe worse.

Energy Vanguard: Understanding Filter Ratings MERV, FPR, MPR
Energy Vanguard describes the three main Filter Ratings including Minimum Efficiency Reporting Value (MERV), Filter Performance Rating (FPR), and Microparticle Performance Rating (MPR).

Handyguys: Podcast On Benefits & Types Of Furnace Filters
Handyguys Podcast covers furnace filters including advantages of a good, clean filter, and the various ratings for filtration products.

Healthy House Institute: Types & Section Of Air Filters
Healthy House Institute describes features and benefits of different types of filters, and factors to consider when selecting the right one for your application.

NIOSH: Principles Of Filtration & Air Cleaning
US National Institute for Ocupational Safety & Health describes the principles governing filtration and air cleaning, and the most important factors you should consider when selecting or enhancing your filtration system. (PDF)
Industry Sectors

NAFA: National Air Filtration Association
National Air Filtration Association is trade association of air filter and component manufacturers, sales and service companies, and HVAC and indoor air quality professionals.
Issues & Performance

ASHRAE: New IAQ Guideline Contains Changes For Use Of High Efficiency Filters
ASHRAE says recent research shows that ultrafine particles are more hazardous to human health than originally thought, and therefore higher-efficiency filters should be used, according to the newly published 2015 version of ASHRAE's residential indoor air quality Guideline 24-2015, Ventilation and Indoor Air Quality in Low-Rise Residential Buildings.

CMHC: Evaluation of Residential Furnace Filters
CMHC report Evaluation of Residential Furnace Filters describes filter types and includes information on performance, value for money, availability, and any special installation requirements. (PDF)

Energy Vanguard: Can Your HVAC System Filter Out Coronavirus?
Energy Vanguard says you definitely can improve your indoor air quality and filter out particles that carry viruses. MERV-13 is the minimum rated filter recommended, but just popping a high-MERV filter in your system may not help because of some well-known unintended consequences.

Energy Vanguard: Do High-MERV Filters Always Reduce Air Flow?
Energy Vanguard looks at what research has been done on high-MERV filters and what can be done to overcome some unintended consequences.

Energy Vanguard: My Low Pressure-Drop, MERV-13 Filters
Energy Vanguard says before you switch out to a high-MERV filter, determine how many square feet of filter area you have for each 400 cfm of air flow. If you're result is two or higher, you should be good to go.

HVAC School: Air Filter Static Pressure Drop
HVAC School says when choosing a filter remember that airflow (Pressure Drop) is just as important to consider as filtration (MERV rating).

HVAC School: How to Measure Air Filter Static Pressure Drop
HVAC school describes how to measure static pressure drop across an air filter using the Testo 510i.

OSTI: IAQ Surface Chemistry & Emissions On HVAC Filters
Office of Scientific and Technical Information paper Investigation of IAQ-Relevant Surface Chemistry and Emissions on HVAC Filter Materials studied chemical processes taking place on the surface of filters that included fiberglass, polyester, cotton/polyester blend and synthetic filter media. It provides a preliminary estimation of the ozone decomposition potential and impact of aldehydes emitted by HVAC filters. (PDF)

CMHC: Study Of Performance Of Residential Electronic Filters
CMHC study researched whether occupants of a household could use simple diagnostics to check the proper operation of their electronic filter, and the number of times per year the various components of an electronic filter need to be cleaned. The high failure rate of the filters during testing made it impossible to achieve these objectives. 2007 (PDF)

Energy Vanguard: 7 Reasons Your Filter Isn't Improving Your Indoor Air Quality
Energy Vanguard gives a few reasons why that filter that you so dutifully change may not be helping your IAQ.

Energy Vanguard: How Often Should You Change the HVAC Filter?
Energy Vanguard discusses issues and considerations for deciding how often you should change the HVAC filter.

Energy Vanguard: Path to Low Pressure Drop Across High-MERV Filter
Energy Vanguard describes how to get a high-MERV filter do a good job of filtration without causing problems with the air flow in the heating and cooling system.

Energy Vanguard: Unintended Consequences of High-MERV Filters
Energy Vanguard describes what a MERV filter is and some of the potential problems with using high-MERV filters in your heating and air conditioning system.

GBA: Devices To Tell When To Replace Filter
Green Building Advisor discusses devices and procedures for deciding when to replace a filter.

GBA: HVAC Systems & Spread of COVID-19
Green Building Advisor says filtration and the movement of air through a building both matter.

Healthy Indoors: How Often Should You Change the HVAC Filter?
Healthy Indoors discusses how often you should change the HVAC filter.

HVAC School: Why HEPA is Great IAQ Option
HVAC School says becasue the HEPA standard isn't something is regulated or policed there are many filters and products that use the term in one way or another. Even the term True HEPA has no scientific meaning and is often used to market products that don't meet the DOE standard.

LBL: Evaluating Filtration System Performance In Homes
Lawrence Berkeley Laboratory online guide Measurement-Based Evaluation of Installed Filtration System Performance in Single-Family Homes provides background information on the factors that impact filtration system performance and specific guidance on how to implement installed performance evaluations. (PDF)

RESNET: Why You Should Keep Your Home Air Filter Clean
US Residential Energy Services Network describes why air filters need to be cleaned regularly in order for your HVAC system to function effectively.

US DOE: California Energy Standards Recognize Importance Of Filter Selection
US Department of Energy says research on HVAC air filter sizing prompted a change in the California Title 24 Energy Code requiring filter manufacturers, HVAC designers, and HERS raters to make changes that will encourage the use of higher MERV filters without degrading HVAC performance.

US DOE: High-MERV Filter Guide
Building America Solution Center online guide describes the uses, selection process and specification of high MERV filters.
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