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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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What criteria should you use to determine when is the best time to change the filter in your HVAC system?
Posted by Allison Bailes on May 20, 2019
One of the topics I've hammered on for years is the inadequacy of using rules of thumb for sizing air conditioners.  The standard one ton of air conditioning capacity for each 400 to 600 square feet of conditioned floor area just doesn't work.  We know that a load calculation based on how 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 23, 2019
Last August I began a series of articles on filtration and indoor air quality.  You can find the list of them at the bottom of this article but let's do a quick review here:  We spend a lot of our time in buildings.  A lot of indoor pollutants are generated in the kitchen and not removed by the...
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High-MERV filters are more restrictive but do they reduce air flow?
Posted by Allison Bailes on January 16, 2019
Over the past few months, I've taken a look at some critical issues for indoor air quality.  Starting with the issue of how much time we spend indoors, I then wrote about kitchen ventilation, the panoply of indoor air pollutants, problems with filters in general and with high-MERV filters.  Now let...
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