ROUND DUCT SIZE ESTIMATE Round Metal Pipe ... Flex duct = .05" on most metal duct calculator Round metal pipe = .06" on most metal duct calculators

Jun 3, 2025 · This flex duct size and CFM chart covers all common sizes at two friction rates. The numbers are those you would obtain using a duct calculator, aka a ductulator.

TEL is the Total Effective Length of the longest supply run and the longest return run.

To figure out exactly how big ducts you need for central air conditioning systems, we have prepared complete CFM duct charts for all different kinds of ducts: Duct sizing chart for flex …

Free HVAC Duct Calculator for Accurate Duct Sizing Use FieldCamp’s free HVAC duct calculator to find the right duct size based on CFM, velocity, and friction rate. Whether you’re sizing …

This free, easy-to-use ductulator helps you quickly calculate duct velocity and pressure drop based on design airflow — no charts, no guesswork, and no physical duct wheel required.

The #1 free HVAC Duct CFM Calculator. Instantly calculate airflow capacity, find duct sizes, and estimate room requirements. Features include Flex Duct friction adjustments, AC tonnage …

This article introduces a user-friendly Duct CFM Calculator that allows you to calculate airflow based on duct shape, size, and air velocity. Designed to support both round and rectangular …

Aug 1, 2025 · Use our duct sizing chart to pick the right duct size for airflow, room size, and system efficiency. Avoid pressure drops and uneven heating or cooling.

The following duct sizes are based on a fraction drop of .10 inches per 100 feet of lineal duct. This "Equal-Friction" method of duct sizing should be adequate for normal residential furnace …