An Airtorch Canister is an unusual ammunition type for Meltaguns and Inferno Pistols that can intensify the heat damage they emit. This ammunition is used most notably in the Koronus Expanse and Calixis Sector. Whilst regular Melta Weapons are known for the tight focus of the superheated blasts they generate, Airtorch ammunition allows them to burn even hotter in a barely-controlled reaction that can almost set the air itself on fire.
Indeed, the heat is so intense that it generally overwhelms the barrel allowing the blast to escape in a wide swath. The more rapid dispersal halves the weapon's range as well. This causes the weapon to prone to overheating, as the heat is more than most Melta weapons can withstand safely.
Sources
- Into the Storm - The Explorer's Handbook (RPG), pg. 128