# Prihoda > Calculates air velocity in fabric ducting and diffusers with visual suitability indicators. (iPhone/iPad app by Příhoda s.r.o..) - Source: https://appshunter.io/ios/app/prihoda/id1148389151 (this page in markdown: same URL + `.md`) - Developer: [Příhoda s.r.o.](https://appshunter.io/developer/1770706453) - Category: Utilities, Business - Price: Free - Rating: 4.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 8.0 · 14 MB - Languages: American English - Released: 2016-09-11 - Data updated: 2026-06-24 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/prihoda/id1148389151/reviews.md ## What is Prihoda? The application is used for calculating air velocities in fabric ducting and diffusers. Upon entering a given airflow, the velocity for the given size is displayed. Upon changing the size, we get the velocity for the given airflow. Values can be entered by moving the ruler or by typing particular values. The color of the speed scale signalizes suitability of the calculated velocity. Red means an unacceptable, orange risky and green suitable velocity. Blue signalizes excessively dimensioned. You can modify the cross section by clicking on the cross section picture. By clicking on the units, their offer is analogously displayed. The calculations are exact and rounded to the values used in real life. Nevertheless, the speed evaluation is only informative. For more information, please visit www.prihoda.com. ## Key features - Air velocity calculation for fabric ducting - Visual suitability indicators (color-coded) - Adjustable airflow and duct size - Interactive cross-section modification - Unit selection and modification - Exact calculations rounded for real-life use ## Frequently asked questions about Prihoda ### What is Prihoda used for? Prihoda is used for calculating air velocities in fabric ducting and diffusers. It helps determine the suitability of calculated velocities based on airflow and duct size. ### How does Prihoda indicate velocity suitability? Prihoda uses a color scale: red for unacceptable, orange for risky, green for suitable, and blue for excessively dimensioned velocities. This provides an immediate visual cue for performance. ### Can I adjust the duct size and airflow in Prihoda? Yes, you can enter values by moving a ruler or typing specific numbers for both airflow and duct size. Changing one will automatically update the calculated velocity. ### Is the speed evaluation in Prihoda always accurate? The calculations are exact and rounded for real-life use. However, the speed evaluation is provided as informative guidance only. ### What devices does Prihoda support? Prihoda is available for iPhone, iPad, and iPod devices. It is designed to run on Apple's mobile operating system. ### How often is Prihoda updated? The latest version, 1.2, was released on September 30, 2017. The app was initially released on September 11, 2016. ### Does Prihoda have ads? No, Prihoda does not contain advertisements. It is a free application without any in-app purchases or ads. ### What is the age rating for Prihoda? Prihoda has an age rating of 4+. This indicates it is suitable for users aged 4 and above. ## Version history (last 3 releases) ### 1.2 — 2017-09-30 This app has been updated by Apple to display the Apple Watch app icon. In order to correctly design the air distribution, it is necessary to know the reach of flows from perforation. These values are determined by entering the static pressure in the duct along with its length and selecting the cross section angle that will be filled by the perforation. The axial flowing speed in the selected distance from the duct is shown on the scale. Alternatively, you can find the distance at which the speed has a certain value. The next screen will show you an illustration of the distribution of speed zones of the whole air flow. ### 1.1 — 2016-09-03 Fixed bug with crashing app after writing letters to text field and with keyboard covering the textfields. ### 1.0 — 2016-09-01 No release notes. ## Apps similar to Prihoda | App | Rating | Price | Category | | --- | --- | --- | --- | | [Vilter Select Lite](https://appshunter.io/ios/app/vilter-select-lite/id1093525035) | 1.0 (1) | Free | Utilities | | [Allday HVAC Calc](https://appshunter.io/ios/app/allday-hvac-calc/id6446276144) | 5.0 (1) | Free | Utilities | | [Castel Regolo](https://appshunter.io/ios/app/castel-regolo/id1586287525) | — | Free | Utilities | | [BF Calc Lite](https://appshunter.io/ios/app/bf-calc-lite/id493803324) | 1.0 (1) | Free | Utilities | | [AI Background Noise Remover](https://appshunter.io/ios/app/ai-background-noise-remover/id6466783471) | 3.4 (56) | Free | Utilities | | [Xylem Cost Calculator](https://appshunter.io/ios/app/xylem-cost-calculator/id1264144162) | 5.0 (1) | Free | Utilities | --- *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 2026-06-24.*