Enter Friction Loss Per 100' of duct (inches of water), Duct Airflow (CFM), Duct Length and the number of bends. Ductulator calculats duct dimensions using equal friction method or velocity method. Universal Metals. Sizing of air duct can be done using Velocity Method, Constant Pressure Loss Method and Static Pressure Recovery Method. Online ducting calculator to find the diameter of duct size. We are a next generation supplier of hard-metals to the aerospace industry as well as other critical application industries. Ductulator calculats duct dimensions using equal friction method or velocity method. Friction Loss Calculator for Flexible Ducts. 1. This Ductulator uses the Colebrook equation to calculate the smallest duct size acceptable for the selected friction rate and duct type that stays within the selected ACCA Manual D recommended velocities. This is the number of square inches in the duct area. click here for more information . Duct cross-sectional area, air flow rate and air speed are used in calculating the duct size. Surface area For help with using this calculator, see the object surface area help page. Download Air Duct Excl Sheets For Calculating duct friction loss, for rectangular and round duct, and equivalent round duct diameter. It calculates both rectangular and round duct dimensions. Rectangular duct is rounded up to the nearest 1/4 inch. Measure the distance across the duct, in inches, then multiply by 3.14159 if the duct is circular to find its circumference, in inches. And it shows the velocity and/or static pressure loss of air for both types of duct shape. HVAC Calculators. This free surface area calculator determines the surface area of a number of common shapes, including sphere, cone, cube, cylinder, capsule, cap, conical frustum, ellipsoid, and square pyramid. Provided by . Duct areas in square feet can be calculated by using geometry rules for round areas. Download excel sheets for air ducts calculations, duct sizing and friction loss. The area will cover a two-dimensional slice of the duct. Rectangular duct is rounded up to the nearest 1/4 inch. Side 1: inches Side 2: inches Diameter: Convert Diameter to Rectangular Equivalent . Online ducting calculator to find the diameter of duct size. Other Hart & Cooley Mobile Tools. We are a next generation supplier of hard-metals to the aerospace industry as well as other critical application industries. Friction Loss Calculator for Flexible Ducts. Friction Loss Calculator for Sheet Metal Ducts. Unless within 2%, the diameter is rounded up to the nearest inch. Ducting Calculator. Return to the Object Surface Area section . Home HVAC HVAC Duct Friction Loss Excel Calculator Free Download HVAC Duct Friction Loss Excel Calculator Free Download -6/28/2016 06:20:00 PM. This free surface area calculator determines the surface area of a number of common shapes, including sphere, cone, cube, cylinder, capsule, cap, conical frustum, ellipsoid, and square pyramid.