Flue gas systems do not have a burner but only "clean" and measure the air before delivering it to the cargo hold.

This generator is sometimes confused with flue gas systems, which draw inert gas from the boiler systems of the ship.

Inert gas is produced on board crude oil carriers (above 20,000 tonnes) by using either a flue gas system or by burning kerosene in a dedicated inert gas generator.

Such a flue gas system mainly consists of a dry sorption system for SO2, HCI, HF, dust reduction, heavy metals, dioxins, etc.

Gas tankers and product carriers cannot rely on flue gas systems (because they require IG with O content of 1% or less) and so use inert gas generators instead.

The flue gas system uses the boiler exhaust as its source, so it is important that the fuel/air ratio in the boiler burners is properly regulated to ensure that high quality inert gas is produced.