Duct sizing rule of thumb

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Get up to 4 Free Quotes! To get the optimal amount of air from your heating and air conditioning system, you need to have the right size of ducts. There are three different ways to calculate duct size, known as the velocity method, constant pressure loss method and static pressure recovery method.

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Sizing ducts properly is not a matter of guesswork or rule-of-thumb engineering. It's a science. And, a critical element of an HVAC installation that delivers optimum comfort and efficiency to Conroe homeowners. Manufacturer's specifications and energy efficiency estimates of new HVAC equipment assume the system will be connected to ductwork sized and designed professionally, utilizing a method such as Manual Dpublished by the Air Conditioning Contractors of America ACCA.

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The Velocity Reduction Method can be used when sizing air ducts. The method can be summarized to. A proper velocity depends on application and environment.

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Before using your old Rule-of Thumb for sizing ducts, it might be good for you to read what Paul Wiebolt of Tradewinds Appropriate Technologies has to say about the subject. It's often said that to do something right, you have to get back to the basics. Sometimes, the basics involve putting aside what you think to be true, and looking at it from a different perspective.

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We design a lot of heating and air conditioning systems at Energy Vanguard. Alexander Bellwho goes by Andy, is our design wizard, and I've been getting involved with the process again lately. When I talk to potential clients, a lot of them tell me their contractor wants to size their air conditioner using a rule of thumb.

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In another thread, I posted that the main supply duct coming out of my 4-ton unit is 8 X 10 inch galvanized duct and a reply said it was "WAY undersized for 4 tons. Is there a rule of thumb or "napkin calculation" for duct sizing that I can use to determine if this is WAY off? If you have a 4-ton system, what size ducts do you have?

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To this point in our little series on duct design, we've been calculating intermediate quantitites: available static pressure, total effective length, and friction rate. Today we use all that to find out how big the ducts need to be. Let's jump right in and see how it works.

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