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Do your own calculations and compare them to our chart – or use the chart for quick, accurate calculations for duct size based on CFM needed for a room. One size is given for round ducts, its diameter.
The table below can be used to compare equivalent diameters for rectangular and round circular ducts. The table is based on the ducts friction loss formula. The rectangular dimensions and the air flow volume are adapted to the equal friction loss method of sizing ventilation duct systems.
A 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.
HVAC duct sizing chart answers one simple question: “What size should my ducts be?” The dimensions of ducts (be it flex, metal, round, or rectangular) determines the airflow (measured in CFM).
Online Ductulator. Home Page. Duct type: Metal Ductboard Flex. Size by: Friction rate Velocity. Friction Rate: per 100 ft. in/wg. Duct TEL : ft. * include fittings in the Duct TEL.
Maximum Air Velocity: FPM. Max. Static Loss/100ft: InWG. Free online ductulator for sizing of HVAC ducts.
The Digitized Ductulator is a free online calculator for sizing HVAC ducts. Use it in one of two ways; either enter the duct size to find the equivalent CFM, or input the CFM to find the right size of rectangular, round or flex duct.
The following duct sizes are based on a friction rate of .10 inches per 100 feet of lineal duct. This “Equal-Friction” method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.
Find the ideal duct dimensions for your HVAC system with h2x's free Duct Size Calculator. Maximise air flow efficiency in your designs.
The flex duct sizing chart and round duct sizing chart below are used by HVAC technicians, handyman services and homeowners to quickly select a supply duct size and return air duct size for each section of your ductwork design.