{"id":1193,"date":"2025-08-30T21:10:13","date_gmt":"2025-08-30T21:10:13","guid":{"rendered":"https:\/\/thermoflowpro.com\/thermo\/?page_id=1193"},"modified":"2026-05-16T11:41:49","modified_gmt":"2026-05-16T11:41:49","slug":"duct-calculator","status":"publish","type":"page","link":"https:\/\/thermoflowpro.com\/thermo\/duct-calculator\/","title":{"rendered":"Duct Calculator"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1193\" class=\"elementor elementor-1193\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bdcd456 e-flex e-con-boxed e-con e-parent\" data-id=\"bdcd456\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1fd21e7 elementor-widget elementor-widget-heading\" data-id=\"1fd21e7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><img decoding=\"async\" class=\"alignnone  wp-image-2300\" src=\"https:\/\/thermoflowpro.com\/thermo\/wp-content\/uploads\/2026\/03\/logo-1-300x300.png\" alt=\"\" width=\"60\" height=\"68\" \/>Duct Calculator<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-35e04a5 e-flex e-con-boxed e-con e-parent\" data-id=\"35e04a5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ccc74ac elementor-widget elementor-widget-text-editor\" data-id=\"ccc74ac\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Optimize your HVAC design with the <b data-path-to-node=\"10,0\" data-index-in-node=\"35\">ThermoFlowPro Duct Calculator<\/b>. This professional-grade tool allows engineers to size air ducts accurately based on flow rate (CFM), air velocity, and friction loss. Whether you are designing for constant volume or variable air volume (VAV) systems, our calculator provides instant results for rectangular, round, and oval ducts, ensuring your ventilation system operates efficiently and quietly.<\/p><p><span style=\"font-weight: bold;\">Version<\/span> : 1.0.2<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1ada8c9 e-flex e-con-boxed e-con e-parent\" data-id=\"1ada8c9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-13d3bcb elementor-align-center elementor-widget elementor-widget-button\" data-id=\"13d3bcb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/thermoflowpro.com\/downloads\/thermo\/apps\/Duct_Calculator_1.0.2.exe\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-download\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M216 0h80c13.3 0 24 10.7 24 24v168h87.7c17.8 0 26.7 21.5 14.1 34.1L269.7 378.3c-7.5 7.5-19.8 7.5-27.3 0L90.1 226.1c-12.6-12.6-3.7-34.1 14.1-34.1H192V24c0-13.3 10.7-24 24-24zm296 376v112c0 13.3-10.7 24-24 24H24c-13.3 0-24-10.7-24-24V376c0-13.3 10.7-24 24-24h146.7l49 49c20.1 20.1 52.5 20.1 72.6 0l49-49H488c13.3 0 24 10.7 24 24zm-124 88c0-11-9-20-20-20s-20 9-20 20 9 20 20 20 20-9 20-20zm64 0c0-11-9-20-20-20s-20 9-20 20 9 20 20 20 20-9 20-20z\"><\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Download<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-993aa6e e-flex e-con-boxed e-con e-parent\" data-id=\"993aa6e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7ed98a3 elementor-widget elementor-widget-text-editor\" data-id=\"7ed98a3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/thermoflowpro.com\/thermo\/customized-apps-duct-calculator\/\">Customize Application<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-99d4f9c e-flex e-con-boxed e-con e-parent\" data-id=\"99d4f9c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bad7e08 elementor-widget elementor-widget-image\" data-id=\"bad7e08\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"478\" height=\"651\" src=\"https:\/\/thermoflowpro.com\/thermo\/wp-content\/uploads\/2025\/10\/02.png\" class=\"attachment-large size-large wp-image-1482\" alt=\"Duct Calculator\" srcset=\"https:\/\/thermoflowpro.com\/thermo\/wp-content\/uploads\/2025\/10\/02.png 478w, https:\/\/thermoflowpro.com\/thermo\/wp-content\/uploads\/2025\/10\/02-220x300.png 220w\" sizes=\"(max-width: 478px) 100vw, 478px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b896972 e-flex e-con-boxed e-con e-parent\" data-id=\"b896972\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9f609cf elementor-widget elementor-widget-heading\" data-id=\"9f609cf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Key Calculation Methods<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a2873fc e-flex e-con-boxed e-con e-parent\" data-id=\"a2873fc\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3b2a862 elementor-widget elementor-widget-text-editor\" data-id=\"3b2a862\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h3 data-path-to-node=\"13\"><b data-path-to-node=\"13\" data-index-in-node=\"0\">Equal Friction Method<\/b><\/h3><p data-path-to-node=\"14\">The most widely used method for sizing supply, return, and exhaust ductwork. Our tool helps you maintain a constant friction rate (e.g., 0.1 in. w.g. per 100 ft) throughout the system to balance airflow.<\/p><h3 data-path-to-node=\"15\"><b data-path-to-node=\"15\" data-index-in-node=\"0\">Velocity Reduction Method<\/b><\/h3><p data-path-to-node=\"16\">Ideal for residential and simple commercial designs where keeping air noise to a minimum is a priority. Set your maximum velocity limits, and let the tool calculate the required duct dimensions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9ac611b e-flex e-con-boxed e-con e-parent\" data-id=\"9ac611b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e7e3dbf elementor-widget elementor-widget-heading\" data-id=\"e7e3dbf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">FAQ<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-44f76d9 e-flex e-con-boxed e-con e-parent\" data-id=\"44f76d9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a1ec227 elementor-widget elementor-widget-text-editor\" data-id=\"a1ec227\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ol><li data-path-to-node=\"29,0\"><b data-path-to-node=\"29,0\" data-index-in-node=\"0\">Q: What is the standard friction rate for duct sizing?<\/b> A: A common industry standard is <b data-path-to-node=\"29,0\" data-index-in-node=\"88\">0.1 in. w.g. per 100 feet<\/b> of duct length, balancing fan power and duct size.<\/li><li data-path-to-node=\"29,1\"><b data-path-to-node=\"29,1\" data-index-in-node=\"0\">Q: Why is aspect ratio important?<\/b> A: Keeping the aspect ratio (Width:Height) close to 1:1 or less than 4:1 reduces friction loss and saves material costs.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e3e9ddc e-flex e-con-boxed e-con e-parent\" data-id=\"e3e9ddc\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cf41a75 elementor-widget elementor-widget-heading\" data-id=\"cf41a75\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Reference\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-230be70 e-flex e-con-boxed e-con e-parent\" data-id=\"230be70\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a8bf507 elementor-widget elementor-widget-text-editor\" data-id=\"a8bf507\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><a href=\"https:\/\/thermoflowpro.com\/downloads\/thermo\/pdf\/duct_01.pdf\" target=\"_blank\" rel=\"noopener\">Duct Friction Loss, ASHRAE Fundamentals 2021<\/a><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cc51616 e-flex e-con-boxed e-con e-parent\" data-id=\"cc51616\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-be2a627 elementor-widget elementor-widget-text-editor\" data-id=\"be2a627\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><a href=\"https:\/\/thermoflowpro.com\/thermo\/duct-weight-calculator\/\">See also duct weight calculator<\/a><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Duct Calculator Optimize your HVAC design with the ThermoFlowPro Duct Calculator. This professional-grade tool allows engineers to size air ducts [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"left-sidebar","site-content-layout":"","ast-site-content-layout":"normal-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-1193","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/thermoflowpro.com\/thermo\/wp-json\/wp\/v2\/pages\/1193","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thermoflowpro.com\/thermo\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/thermoflowpro.com\/thermo\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/thermoflowpro.com\/thermo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/thermoflowpro.com\/thermo\/wp-json\/wp\/v2\/comments?post=1193"}],"version-history":[{"count":96,"href":"https:\/\/thermoflowpro.com\/thermo\/wp-json\/wp\/v2\/pages\/1193\/revisions"}],"predecessor-version":[{"id":3007,"href":"https:\/\/thermoflowpro.com\/thermo\/wp-json\/wp\/v2\/pages\/1193\/revisions\/3007"}],"wp:attachment":[{"href":"https:\/\/thermoflowpro.com\/thermo\/wp-json\/wp\/v2\/media?parent=1193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}