# Gas Ventilation Calculator UK > Domestic gas appliance ventilation size calculator for UK regulations. (iPhone/iPad app by Mr Combi Training.) - Source: https://appshunter.io/ios/app/gas-ventilation-calculator-uk/id584042243 (this page in markdown: same URL + `.md`) - Developer: [Mr Combi Training](https://appshunter.io/developer/566867832) - Category: Productivity, Utilities - Price: $4.99 - Age rating: 4+ - Requires: iOS 8.0 · 2 MB - Languages: American English - Released: 2012-12-08 - Data updated: 2026-08-14 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/gas-ventilation-calculator-uk/id584042243/reviews.md ## What is Gas Ventilation Calculator UK? The Gas Ventilation Calculator will help you find the required ventilation sizes for domestic flueless, open flue and room sealed appliances up to 70kW (net). It also supports multiple rooms, multiple appliances and includes an extractor fan calculator and a vent size calculator. Flueless: This calculator will find the required vent size for flueless appliances such as cookers, grills, water heaters and fires. Enter the dimensions of the room and the heat input of the appliance and the calculator will find the vent size required or advise if no vent is needed or that the appliance should not be fitted in that room. Open Flue: Enter the appliance heat input and select whether adventitious air is available or if the appliance is in a compartment and the calculator will find the required vent sizes. Multiple Rooms: For an open flue appliance where the path to outside is via another room use the 'Walls to outside' option within the Open Flue Calculator to select the number of walls vents need to be fitted into. It will also take into account adventitious air or if the appliance in a compartment as per the selected options. Room Sealed: For a room sealed appliance simply enter the heat input and the calculator will find the vent sizes required if the appliance is in a compartment. Multiple Appliances: For multiple appliances in one room this app simply provides a guide to remind you of the regulations. The other calculators will then need to be used to find the required vent size. Extractor Fan: To find the required performance of a fan for a room enter the room dimensions and type and the performance will be found using pre-set air change rates. A manual ACH can be entered also. Vent Size: A calculator is included to find the total size of a vent with rectangular or circular holes. ## Key features - Flueless appliance ventilation calculation - Open flue appliance ventilation calculation - Room sealed appliance ventilation calculation - Multiple room and appliance support - Extractor fan performance calculation - Vent size calculation (rectangular/circular) ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/gas-ventilation-calculator-uk/id584042243/reviews.md ### 5/5 — Great apps *2017-10-04* Great apps stops me worrying about ACS ## Frequently asked questions about Gas Ventilation Calculator UK ### What is the Gas Ventilation Calculator UK used for? The Gas Ventilation Calculator UK is used to determine the necessary ventilation sizes for various domestic gas appliances, including flueless, open flue, and room-sealed types, up to 70kW net heat input, adhering to UK regulations. ### Does the Gas Ventilation Calculator UK support multiple appliances in one room? Yes, for multiple appliances in a single room, the app provides a guide to remind users of the regulations. Separate calculators within the app will then need to be used to determine the required vent size. ### Can the Gas Ventilation Calculator UK calculate extractor fan requirements? Yes, the app includes an extractor fan calculator. You can enter room dimensions and type to find the required fan performance based on pre-set air change rates, or input a manual ACH. ### What types of gas appliances does the Gas Ventilation Calculator UK cover? It covers flueless appliances like cookers and fires, open flue appliances, and room-sealed appliances. It supports appliances with a net heat input of up to 70kW. ### Is the Gas Ventilation Calculator UK available on Android devices? Based on the provided data, the Gas Ventilation Calculator UK is supported on iPhone, iPad, and iPod. Information regarding Android compatibility is not available. ### How often is the Gas Ventilation Calculator UK updated? The Gas Ventilation Calculator UK was last updated on December 5, 2018, with version 2.5. The frequency of updates is not specified, but the last update was over four years ago. ### What is the price of the Gas Ventilation Calculator UK? The Gas Ventilation Calculator UK is a paid application, priced at $4.99. There are no in-app purchases or subscription models mentioned. ### Does the Gas Ventilation Calculator UK have ads? No, the Gas Ventilation Calculator UK does not contain advertisements. The app is ad-free, as indicated by the 'hasAds' flag being false. ## Version history (last 5 releases) ### 2.5 — 2018-12-05 We've made some small tweaks for iOS 12. ### 2.4 — 2015-08-05 We've made a few tweaks here and there plus we added some handy extra buttons for iOS 8 users. ### 2.3 — 2014-11-17 A few tweaks and we've also added some guidance about DFE appliances. ### 2.2 — 2014-08-23 We've made a few tweaks here and there, you won't notice much but we're working hard to keep our apps on top form. ### 2.1 — 2014-02-27 Bug fixes ## Apps similar to Gas Ventilation Calculator UK | App | Rating | Price | Category | | --- | --- | --- | --- | | [Gas-main](https://appshunter.io/ios/app/gas-main/id1522466692) | — | Free | Productivity | | [Botslab AI](https://appshunter.io/ios/app/botslab-ai/id1643095773) | — | Free | Productivity | | [LEADSHUB APP](https://appshunter.io/ios/app/leadshub-app/id1608051157) | — | Free | Productivity | | [Site Report 2](https://appshunter.io/ios/app/site-report-2/id1277218877) | 4.4 (7) | $11.99 | Productivity | | [ETC6300 Connect](https://appshunter.io/ios/app/etc6300-connect/id6476158347) | — | Free | Productivity | | [KANE LIVE](https://appshunter.io/ios/app/kane-live/id1594399447) | — | Free | Productivity | ## More apps by Mr Combi Training - [Gas Pipe Sizing Calculator](https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id570414217) - [Gas Rate Calculator & Guide](https://appshunter.io/ios/app/gas-rate-calculator-and-guide/id588849050) - [Heatloss Calculator & Guide](https://appshunter.io/ios/app/heatloss-calculator-and-guide/id620793018) - [Wiring & Controls - Diagrams](https://appshunter.io/ios/app/wiring-and-controls-diagrams/id1021997871) - [Fault Finding & Multimeters](https://appshunter.io/ios/app/fault-finding-and-multimeters/id1212143364) All apps by Mr Combi Training: https://appshunter.io/developer/566867832 ## Related topics [gas ventilation calculator uk](https://appshunter.io/ios/topics/gas-ventilation-calculator-uk) · [hamilton vent trainer](https://appshunter.io/ios/topics/hamilton-vent-trainer) · [ventilation](https://appshunter.io/ios/topics/ventilation) --- *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 2026-08-14.*