# Thermaflex Duct Calculator > HVAC duct sizing calculator for Thermaflex products based on volume and friction loss. (iPhone/iPad app by Gastite Products LLC.) - Source: https://appshunter.io/ios/app/thermaflex-duct-calculator/id671835022 (this page in markdown: same URL + `.md`) - Developer: [Gastite Products LLC](https://appshunter.io/developer/668653608) - Category: Utilities, Productivity - Price: Free - Rating: 2.00/5 from 1 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 10.0 · 4 MB - Languages: American English - Released: 2013-07-19 - Data updated: 2026-06-06 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/thermaflex-duct-calculator/id671835022/reviews.md ## What is Thermaflex Duct Calculator? Thermaflex is literally at your fingertips with this convenient and easy-to-use application for the iPhone. This app allows HVAC engineers to determine the smallest size Thermaflex duct recommended for the installation at hand, based on the project’s specific volume and friction loss. Simply select the Thermaflex product you’re installing, as well as the friction loss and volume present in the system – the app will calculate the velocity of the system and display the appropriate size Thermaflex duct for your application. Features 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 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. ## Key features - Calculate recommended duct size - Input project volume and friction loss - Select Thermaflex product - View system velocity - Access product specifications - Contact support directly ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/thermaflex-duct-calculator/id671835022/reviews.md ### 1/5 — mt *2017-11-30* deleted in less than 10 seconds ## Frequently asked questions about Thermaflex Duct Calculator ### What is the Thermaflex Duct Calculator used for? The Thermaflex Duct Calculator is a utility app designed for HVAC engineers. It helps determine the smallest recommended Thermaflex duct size for an installation by calculating system velocity based on project volume and friction loss. ### How accurate is the Thermaflex Duct Calculator? The calculator uses applicable test data in consideration of the Air Diffusion Council’s “Flexible Performance & Installation Standards” green book, aiming for accuracy in duct installation recommendations. ### What information do I need to use the Thermaflex Duct Calculator? To use the Thermaflex Duct Calculator, you need to know the project's specific volume and friction loss. You will also select the Thermaflex product you are installing. ### Can I get help if I have questions about the Thermaflex Duct Calculator? Yes, the app includes a Contact Page that allows users to submit questions and requests directly to the Thermaflex team for assistance. ### What devices does the Thermaflex Duct Calculator support? The Thermaflex Duct Calculator is available for iPhone and iPod devices. ### How often is the Thermaflex Duct Calculator updated? The app was last updated on October 5, 2017, to version 1.2. It was originally released on July 19, 2013. ### What is the age rating for the Thermaflex Duct Calculator? The Thermaflex Duct Calculator has an age rating of 4+, making it suitable for a wide range of users. ### Does the Thermaflex Duct Calculator have ads? No, the Thermaflex Duct Calculator does not contain advertisements, as indicated by its free pricing and lack of an 'ad-supported' monetization model. ## Version history (last 3 releases) ### 1.2 — 2017-10-05 This app has been updated by Apple to display the Apple Watch app icon. - Expanded support for 64-bit architecture and iOS 11 - Updated user interface for compatibility with iPhone 6/6+, iPhone 7/7+, iPhone 8/8+ and iPhone SE ### 1.1 — 2013-07-28 - Minor bug fixes ### 1.0 — 2013-07-18 No release notes. ## Apps similar to Thermaflex Duct Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [Duct Calculator](https://appshunter.io/ios/app/duct-calculator/id1078238132) | 4.5 (179) | $19.99 | Utilities | | [Duct Calculator S&P](https://appshunter.io/ios/app/duct-calculator-s-and-p/id1096043356) | 5.0 (1) | Free | Utilities | | [Duct Calculator Elite](https://appshunter.io/ios/app/duct-calculator-elite/id665701601) | 4.8 (220) | $6.99 | Utilities | | [Allday HVAC Calc](https://appshunter.io/ios/app/allday-hvac-calc/id6446276144) | 5.0 (1) | Free | Utilities | | [Fabric Ductulator](https://appshunter.io/ios/app/fabric-ductulator/id6477066235) | — | Free | Utilities | | [IN HVAC Calculator](https://appshunter.io/ios/app/in-hvac-calculator/id1219008229) | 4.2 (11) | Free | Utilities | ## More apps by Gastite Products LLC - [Sizing US/CA](https://appshunter.io/ios/app/sizing-usca/id1420112805) All apps by Gastite Products LLC: https://appshunter.io/developer/668653608 ## Related topics [thermaflex duct calculator](https://appshunter.io/ios/topics/thermaflex-duct-calculator) · [ductemissiontool](https://appshunter.io/ios/topics/ductemissiontool) · [duct calculator elite](https://appshunter.io/ios/topics/duct-calculator-elite) · [air duct calculator](https://appshunter.io/ios/topics/air-duct-calculator) · [in hvac calculator](https://appshunter.io/ios/topics/in-hvac-calculator) · [duct calculator pro](https://appshunter.io/ios/topics/duct-calculator-pro) · [air duct size calculator](https://appshunter.io/ios/topics/air-duct-size-calculator) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-06.*