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A pair-of-pants tee fitting for the duct system for my new Mitsubishi ducted mini-split heat pump
Posted by Allison A Bailes III, PhD on June 29, 2020
I've written about the load calculation and equipment selection process I went through for the new Mitsubishi* ducted mini-split heat pump in my house.  Now let's take a look at the design and performance of the duct systems for the two air handlers.  Laying out the ducts The schematic diagram...
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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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An older house with ducts located in the third worst place you can put them
Posted by Allison Bailes on August 14, 2019
Ah, so many choices.  If you want to design and install a duct system to create problems, the possibilities are endless.  I've certainly written about a lot of them (as well as how to do it properly).  Today, though, let's focus on one particularly bad place to put a duct.  In fact, I think it's...
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A nasty spot on this ceiling tile in my basement indicates a moisture problem
Posted by Allison Bailes on July 18, 2019
That photo above is from my basement.  In case you missed my last article, I just bought a 1961 ranch-style house in Atlanta and am embarking on the wonderful building science adventure of turning it into a high-performance home.  Ultimately, I'd like to take it all the way to net zero energy, too...
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Crazy ventilation duct system mess
Posted by Allison Bailes on September 25, 2018
I've posted a lot of crazy duct system photos here in this blog.  Remember "Release the Kraken!"?  How about "Two Jellyfish Mating"?  And about three years ago I found one that instantly became my new favorite duct disaster.  But those were all in fairly standard homes.  They didn't have any...
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