MERV, or Minimum-Efficiency Reporting Value, is a measure of the efficiency with which filters remove particles of specific sizes.

According to the Standard 52.2 application guidelines, particles in this size range include pollen, dust mites, mold spores, hair spray, powdered milk, and, of course, snuff. Higher
MERV ratings (from 13 to 16) are needed to remove bacteria and smoke
particles. At the top of the scale are HEPA filters with MERV ratings
from 17 to 20, which can filter out particles smaller than 0.3 microns,
including some viruses.

 It stands to reason that the ability to filter smaller particles would come with the penalty of increased resistance to air flow. Could the shift to better filters mean that they could
cause problems with inadequate air flow or greater fan energy use? Are
all high-MERV filters equal, or do some have less pressure drop than
others? How much better are 2-inch and 4-inch-thick pleated filters than
1-inch filters? Are larger ducts required to offset the added pressure
drop of the filter? With a pat on the back from our Building America
program sponsors, my colleagues and I at Davis Energy Group, in Davis,
California, decided to run some tests to answer these questions.

 

Read David Springer's article in the November/December, 2009 issue of Home Energy.

Views: 159

Discussion Forum

Got insulation?

Started by Debra Little. Last reply by Jason Raddenbach May 25. 2 Replies

Return Possum

Started by Stefan Peter-Contesse. Last reply by Alice La Pierre Oct 26, 2015. 1 Reply

Easy Water Heater Venting

Started by Kari Sauder. Last reply by Matthew Lutz Oct 23, 2014. 22 Replies

Thank-less water heater

Started by Andy Simms. Last reply by Dennis Heidner Jun 13, 2013. 12 Replies

Latest Activity

Profile IconDan Kolbert, Sean Wiens, Colleen FitzSimons and 18 more joined Home Energy Pros Forum
1 minute ago
Diane Chojnowski replied to Diane Chojnowski's discussion Volunteers needed for Solar Decathlon 2017 - Denver, CO
"Check out the Volunteers page to find a role that fits…"
1 hour ago
Diane Chojnowski replied to Sonja Persram's discussion Energy Savings Guarantee for single family dwellings in cold climate??
"Here's info on Minnesota's GESP: https://www.cleanenergyresourceteams.org/gesp"
1 hour ago
Profile IconMatthew Richmond and Lee Morris joined Sean Lintow Sr's group
Thumbnail

Best Practices (Residential)

Best Building, Retrofitting, or even Auditing Practices - what are they, what should change, what…See More
2 hours ago
Lee Morris joined Diane Chojnowski's group
Thumbnail

Hall of Shame

In this group, members share an array of images from the field, showing the kinds of issues…See More
3 hours ago
Lee Morris joined allen p tanner's group
Thumbnail

Energy Auditing Equipment for Sale, Trade or to Purchase

Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
3 hours ago
Lee Morris joined Building Performance Institute's group
Thumbnail

Building Performance Institute (BPI)

BPI is the nation's premier standards development, quality assurance and credentialing organization…See More
3 hours ago
Lee Morris joined Norm Bourassa's group
Thumbnail

Multifamily Buildings

For too long there has been relatively little EE focus on multifamily, but some new programs have…See More
3 hours ago

Photos

Loading…
  • Add Photos
  • View All

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service