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: 157

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 IconBryan Magnuson and Rodney Bailey joined Home Energy Pros
39 minutes ago
Laurie DiDonato updated an event

Hybrid HERS Rater Training September 2017 (NH) at Online/ Classroom in Manchester, NH

September 11, 2017 at 9am to October 6, 2017 at 5pm
EARLY BIRD DISCOUNT: Register by August 15th and get $200 off!This training has been approved by…See More
17 hours ago
Profile IconEmily Rhea, Spray-on Foam and Keith Flores joined Home Energy Pros
Friday
Kent Browning replied to Brandon Walton's discussion When is it too windy to use blower door?
"I found this post thru a Google search. I was already a member and have posted a few times. I am a…"
Friday

Photos

Loading…
  • Add Photos
  • View All

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service