The Latest from the Energy Vanguard Blog

A MERV-13 filter in a return filter grille in my dining room ceiling
Posted by Allison Bailes on June 24, 2020
Filtration is on the minds of a lot of people lately.  Because of the coronavirus pandemic, most of us would prefer not to breathe in air that contains any hint of the SARS-COV-2 virus that's been spreading the illness known as COVID-19.  Wearing a mask when going out in public is standard.  Having...
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The outdoor unit for our new Mitsubishi inverter-driven mini-split heat pump system
Posted by Allison Bailes on June 11, 2020
Last year my wife and I bought a 1961 ranch-style house, and I've been having a lot of fun fixing it up.  I wrote about the problem with the spray foam in the attic not covering the top plates and how I fixed it when we had the soffits, fascias, and gutters replaced.  I've also had a lot more spray...
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The three main rating scales for filter efficiency:  MERV, FPR, and MPR
Posted by Allison Bailes on May 28, 2020
As much as I've written about filters and filtration in this blog, I have to confess there's one aspect of filter efficiency I've resisted learning about.  Every article I've written that mentions filter efficiency talks about only one rating scale:  Minimum Efficiency Reporting Value (MERV).  A...
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Using a high-MERV filter doesn't have to result in a large pressure drop
Posted by Allison Bailes on April 10, 2020
Yesterday I gathered with a few of my friends and colleagues from the building performance community for a virtual happy hour.  During our chat, Steve Byers of Energy Logic posed the question:  Compared to BC (before coronavirus), how will you be different once the stay-at-home orders are lifted,...
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Droplets from a sneeze can travel 18 feet across a room
Posted by Allison Bailes on April 8, 2020
Back in 2018 I wrote a series of articles on indoor air quality and filtration.  One of those articles, The Unintended Consequences of High-MERV Filters, has seen a flurry of activity in the comments over the past three weeks.  It all started when a reader named Pat wrote: I have a question about...
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An image from the first U.S. case of COVID-19, formerly known as 2019-nCoV.   [Image from the CDC]
Posted by Allison Bailes on March 19, 2020
Well, there's nothing like a little pandemic to completely upend our daily lives as well as our short and long-term outlooks for the future.  I've spent far too much time reading about, listening to, and watching news about the novel coronavirus lately and I guess you may have done likewise.  Here'...
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