Determining Air Duct Sizing by Velocity of AirĪir velocity, or airflow, gets measured in cubic feet per minute (CFM) and is directly proportional to the size of ductwork. For rooms that aren’t perfectly square or rectangular, such as an L-shaped space, split the room into sections and total the area of each section. So, if a room measures 10-by-10 feet, the total area equals 100 square feet. You can also refer to a building’s blueprint, zoning drawings on file with the local planning office, or a recent real estate listing for the space, if available.
To calculate the area of a rectangular or square room, simply multiply the length and width of the room.
Figure Square Footage of SpacesĪ duct sizing chart relies foremost on the square footage of a home or office space-but, more importantly, the size of each individual room within the building. Save time on the job and do less manual math by using our free, online ServiceTitan Ductulator to easily calculate the right size duct for your projects.īelow we walk through the various formulas you will need to compute, and enter into the duct calculator. Free Online Ductulator ToolĪ duct size calculator, commonly known as a ductulator, depends on factors like the size of the space you’re heating or cooling, air flow velocity, friction loss, and available static pressure of the HVAC system. None of those scenarios result in happy customers after they’ve paid big bucks for a new, more efficient HVAC system or upgraded ductwork. Incorrect duct size can also cause inadequate airflow to certain areas and produce unwelcome noise. Using the wrong size duct for the space can prematurely wear out HVAC components and will likely increase customers’ energy expenses.
To check for accurate measurements, many techs rely on HVAC duct sizing calculator free tools, such as a ductulator.
BUILDING AIRFLOW STANDARD CALCULATOR SPREADSHEET INSTALL
Too large or too small HVAC ductwork sizing can cause problems similar to what happens when technicians install an improperly sized HVAC unit.
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