# GB Gas Ventilation Calculator

> BS5440 Calculator

Canonical page: [https://chrome-stats.com/d/id426220160](https://chrome-stats.com/d/id426220160)

## Overview

- **ID:** `id426220160`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** GB-GAS.CO.UK
- **Category:** Business
- **Version:** 6
- **Last updated:** 2026-08-15
- **First published:** 2011-03-26
- **Size:** 3.25 MB
- **Data as of:** 2026-09-18
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/gb-gas-ventilation-calculator/id426220160)
- **Privacy policy:** [http://www.gb-gas.co.uk/disclaimer.html](http://www.gb-gas.co.uk/disclaimer.html)

## Description

Calculate permanent ventilation quickly and accurately for Natural Gas and LPG appliances. Includes multi-appliance calculations, vent sizing and printable reports.

A Gas Ventilation calculator for working out ventilation requirements for gas appliances. Open flued, Room sealed, Flueless appliances. 
This gives you the option of working out ventilation when more than one appliance is fitted in a room.
For existing and new ventilators you can calculate the free air area of the vent to work out if its suitable for the appliance(s) it is feeding.
No more formulas and calculations to remember, read the heat input from the appliance data badge and press calculate.

## Rankings

- #1,012,293 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id426220160)