An observation of ducts
Before you read any further, assign a percentage of importance to each of the four duct-related factors below. Together they […]
Manual D
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I know I’ve said this a lot: A duct can’t be too big. But something can…
There’s a common misconception in the field that duct sizing is mostly about “keeping ducts small to keep the air moving.” You’ve heard it: “Smaller ducts make the air go where it’s supposed to.” But the truth is, as ACCA Manual T® makes clear, air distribution isn’t about how fast you can shove air through an airway — it’s about delivering the required volume to the supply register.
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Manual D® or duct design: How are you calculating airways?
Something I’ve observed for quite some time, but it seems to need more attention lately, is how we are actually sizing airways— commonly referred to as ductwork. I appreciate when people say they’re using the Manual D® process when discussing duct designs.
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Is it necessary to have a return duct in every room?
Is one return enough? Had a conversion will a fella about a topic I hear about far too often. He had someone ask (require) for there to be a return in every room. I knew Manual D® didn’t say that.
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ACCA Presentation During ICC Annual Conference in Long Beach, CA
ACCA conducted a presentation during the International Code Council’s (ICC) 2024 Annual Conference at the Long Beach Convention Center in Long Beach, California. The session was part of the “PMG” track (Plumbing, Mechanical, Fuel Gas) during the October 22 education program.
Understanding the Importance of Proper HVACR System Design for Your Client
When determining the correct size for HVACR equipment in a home, it’s crucial to look beyond just the model number. […]
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What kind of damper are you using?
In HVACR systems, the term “damper” can refer to various types of devices used to regulate airflow. Here are some common types of dampers, including those that might come up in a discussion related to Manual D®, which is a methodology for sizing residential duct systems.
Hey Ed, What is Friction Rate?
What exactly is friction rate? Learn where to find the calculation rate in this edition of “Hey Ed!”
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The Right Filter – Don’t Guess at Pressure Drop
Finding the correct pressure drop is often made up rather than looked up. Ed Janowiak explains this issue and offers a solution in this blog.
