Thursday 1 November 2018

How to calculate duct size

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How do you calculate the CFM of a duct? How to calculate soffit vent size? Determine the required cubic feet per minute for your home. Record the CFM calculated in Step 1. This will indicated what size , in. To calculate CFM , you need to know the size of your heating or cooling unit in tons.


Multiply this number by 40 which is the average output of an HVAC unit.

Then divide by the total square footage of your home. Look at the plate on your furnace to figure out how many BTUs it produces. Divide your number by 10. The calculated duct size is applied to the entire duct segment. For example, you may want to reduce the duct size at all points where the system services air diffusers.


To refine your system, you can break a duct into segments and recalculate sizes. For more information, see Breaking or Merging Duct Segments. Guide for how to design a ductwork system. Full worked example included with CFD simulations to optimise your design to ensure the highest energy efficiency.


Using a duct calculator. You can also do this by checking for them online or by using a manual that is sold by distributors. If a room is 2square feet, the result will be a duct size of 8-inch round.


Calculate the duct size by using a duct calculator. You can obtain these from ductwork manufacturers or from industry bodies such as CIBSE and ASHRAE. To size the ducts you’re going to need a duct sizing chart.

If you don’t have one, you can find them in the following links. These charts hold a lot of information. The goal of duct sizing is to provide the perfect space through which heated and cooled air can travel around your Conshohocken home.


Based on the calculated dimensions, the air velocity will be calculated for both duct shapes and dimensions.

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