Unless within 2%, the diameter is rounded up to the nearest inch. 2) scale of the drawing sheet. Abbeville, SC 29620. This is due to the large number of variables that can effect the pressure drop for flex, such as whether it is pulled taut or loose, straight or with bends. 2. Minimum friction loss will only be obtained when the duct is properly installed. Most old calculators (including cardboard and other online simulators) only use the given velocity to calculate the diameter of the round duct then it calculates the static pressure loss for the round duct and uses that static pressure to calculate the rectangular duct dimensions which is not correct for fixed velocity. 2. Simply select the Thermaflex product you’re installing, as well as the friction loss and volume present in the system, and the app will calculate the velocity of the system and display the appropriate size Thermaflex duct for your application. It calculates both rectangular and round duct dimensions. © Quietflex Manufacturing Co., LP, Ctrl-I: Next diameter for current input (, Ctrl-B: Previous diameter for current input (. To know how Ductulator works, click on the following link: In addition to all Ductcalc.Ca standard calculation methods and features you get: If you are enjoying this free online Ductualtor app, support us and enjoy using the app offline by downloading and subscribing to DuctCalc.Ca for iOS on the following App Store link: Compression correction for flexible duct: Why Ductcalc.Ca is more accurate and easier to use than cardboard Ductulators and other free software simulators. Friction Rate Calculator. Use this tool at your own risk. But opting out of some of these cookies may have an effect on your browsing experience. Enter Duct Airflow (CFM), Duct Velocity (FPM), Duct Length and the number of bends. Enter the Length of the Rectangular Duct. Enter the Width of the Rectangular Duct. 2. Duct Segment Originates at Branch Flow of # 1 Entering Branch (ACFM): Velocity Pressure of # 1 Entering Branch (inches Water): Flow of # 2 Entering Branch (ACFM): Velocity Pressure of # 2 Entering Branch (inches Water): Note: Sum of flows in branches # 1 and # 2 must equal Flow Rate in ACFM input above. We also use third-party cookies that help us analyze and understand how you use this website. Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends. Ductulator calculats duct dimensions using equal friction method or velocity method. Read Round Duct Diameter (inches) and Friction Loss Per 100' of duct (inches of water). All Duct Calculator. Read Duct Diameter (inches) This calculator uses the applicable test data in consideration of the acceptable practice of duct installation as specified in the Air Diffusion Council’s “Flexible Performance & … This calculator is intended for use with all Quietflex flexible ducts. If you experience any problems with this website or have any general comments, please fill in the following contact form: Enter flow rate (L/s) and duct diameter (mm) to begin sizing, Select the duct material from the drop-down list (most duct sizing tools are typically based on galvanised steel ducting by default), Enter the air flowrate in litres/second (can change to cubic metres/second by use of drop-down to the right of the input), Enter an internal duct size (this must be limited to a maximum aspect ratio of 5:1 for the results to be valid). when the quantity take off is completed, take 10% extra of duct this will resolve the quantity assumption . Before you get in to the estimation you have to consider two things in the drawing sheet. In practice, it is not uncommon for flexible duct to have up to around 5 or 6 times the resistance of the equivalent sized straight galvanised steel duct. You also have the option to opt-out of these cookies. And it shows the velocity and/or static pressure loss of air for both types of duct shape. Use the online duct calculator (see References) and calculate the needed flex duct size. Other Hart & Cooley Mobile Tools. Read Friction Loss (inches of water) and Duct Velocity (FPM). Ductulator is an engineering tool to calculate air duct dimensions based on given inputs including air-flow, duct material roughness and either air pressure static loss (friction method) or air velocity (velocity method). Equivalent Duct Calculator (Round vs Rectangular) The output also includes air velocity when air static loss is an input (friction method) or it includes air static loss when velocity is an input (velocity method). Read Round Duct Diameter (inches) and Friction Loss Per 100' of duct (inches of water). BACK TO TOP. Enter the Desired Length of the Rectangular Duct. This calculator uses the applicable test data in consideration of the acceptable practice of duct installation as specified in the Air Diffusion Council’s “Flexible Performance & Installation Standards” green book. Rectangular duct is rounded up to the nearest 1/4 inch. Disclaimer: Although much time and effort have been spent to make this ductulator accurate, the developer is not liable for its results or the way it is used. 4518 Brittmoore Houston, Texas 77041 877.694.3669 Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends. Flexible Duct Calculator - HVAC - Based on Friction Loss: Enter Friction Loss (inches of water), Duct Airflow (CFM), Duct Length and the number of bends. Click "calculate" and you will see the size of flex duct you need for that room. These cookies do not store any personal information. National Sales Headquarters & Customer Service Dept. Ductcal.Ca Free is temporarily unavailable. Mostly it would be in millimeters. We use cookies to improve your experience. These excel sheets will enable you to calculate or estimate the duct weight or the duct surface area. 1) units of height and width of a duct. 1. Online ducting calculator to find the diameter of duct size. Ductcalc.Ca calculates different static pressure loss for rectangular duct when velocity method is selected. CFM is flow rate in flex duct, cubic feet per minute. Friction Loss Calculator for Sheet Metal Ducts. The resulting velocity and pressure drop per unit length are displayed in the blue box. Duct roughness and air properties are adjustable and includes a metric option. This category only includes cookies that ensures basic functionalities and security features of the website. It calculates both rectangular and round duct dimensions. 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. Read Duct Diameter (inches) and Duct Velocity (FPM). Be the first to rate this post. CFM is flow rate in flex duct, cubic feet per minute. It will also determine round duct equivalents for rectangle, flat oval, and elliptical (flattened round) duct. The creator of calcuDUCT takes no responsibility for the accuracy of the results. Online Ductulator Free Duct Size Calculator. AllDuctCalc™ - HVAC Air Duct Calculator v2 Updated 10/26/15: Provide inputs in the blue boxes, other inputs optional. Thermaflex is literally at your fingertips with this convenient and easy-to-use application for iPhone and Android. 3131865CRT-001. Enter flow rate (L/s) and duct diameter (mm) to begin sizing . 2. 1. Thanks, please check your inbox or spam folder to confirm your subscription. 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 Enter either: CFM: or Duct Size: CFM: Convert Rectangular duct to Round Equivalent . Online Ductulator Free Duct Size Calculator. Open Calculator. No votes so far! and installation standards". Sheet Metal Duct Friction Loss Calculator. 1. This website uses cookies to improve your experience while you navigate through the website. Ductulator calculats duct dimensions using equal friction method or velocity method. The data is based on standard air 0.075 pounds per cubic foot density. Select the duct type on the pull down menu. 1. Read Duct Diameter (inches) and Duct Velocity (FPM). These cookies will be stored in your browser only with your consent. Enter the Length of the Rectangular Duct. This app allows HVAC installers to determine the smallest size Thermaflex duct recommended for the installation at hand, based on the project’s specific volume and friction loss. Duct cross-sectional area, air flow rate and air speed are used in calculating the duct size. found in the air diffusion council's booklet "flexible duct performance Data is based on straight runs of Quietflex non-metallic flexible air ducts as tested in accordance with the Air Diffusion Council FD-72R1 test code and Read Friction Loss Per 100' of duct (inches of water) and Duct Velocity (FPM). This online ductulator calculates the dimensions for both round and rectangular duct options (one dimension should be entered by the user for rectangular duct). HVAC Calculators. And it shows the velocity and/or static pressure loss of air for both types of duct shape. For installation instructions refer to the duct package. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website. We are sorry that this post was not useful for you! An inclusive air duct calculator for diameter, velocity, CFM, and pressure drop of various types of duct. Enter Friction Loss Per 100' of duct (inches of water), Duct Airflow (CFM), Duct Length and the number of bends. Friction Loss Calculator for Flexible Ducts. Further instructions on the installation of flexible air ducts may be Enter Friction Loss (inches of water), Duct Airflow (CFM), Duct Length  and the number of bends. To calculate the rectangular duct area, we need height, width and length. FPM is velocity in flex duct, feet per minute. Refer to the terms of use for more information. 2. Enter the Desired Length of the Rectangular Duct. Values can be selected quickly by scrolling, Contact page submits questions and requests directly to Thermaflex team, Products page presents product photos, features and specifications. Enter Duct Airflow (CFM), Duct Velocity (FPM), Duct Length and the number of bends. Note that when using velocity method, unlike conventional ductulators, this ductulator will calculate the dimensions of the rectangular duct based on the given velocity and it then calculates the static pressure loss for the rectangular duct based on the given velocity and dimensions. Necessary cookies are absolutely essential for the website to function properly. Before using the results, the user should verify against another reliable method. Download Also: HVAC Duct Friction Loss and Sizing Excel Sheets. We'll assume you're OK with this, but you can opt-out if you wish. © 2020 HVAC and Solar Energy Engineering Calculations. QUICK-GUIDE. All file uploads are subject to our Privacy Policy. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. FPM is velocity in flex duct, feet per minute. Box 927 (381 Carwellyn Road) 2. 1. ocity and pressure drop per unit length are displayed in the blue box. Ducting Calculator. For general inquiries, click the button below to fill out our contact form. HVAC Duct Quantity, Weight and Area Calculator Input the required CFM in the box below that. Friction loss (pressure drop) is in units of inches of water gauge per 100 feet of length. The calcuDUCT website is intended to provide design assistance only. Sizing of air duct can be done using Velocity Method, Constant Pressure Loss Method and Static Pressure Recovery Method. The calculator assumes the duct is installed in the uncompressed condition. in accordance with ASHRAE 120-1999 "method of testing to determine flow resistance of HVAC ducts and fittings" Intertek report No.

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