What is that thing that looks like a chimney at the back of your vintage gas stove?

The chimney-like structure at the back of a vintage gas stove is typically the flue or vent. Its purpose is to direct combustion gases safely out of the home, preventing the buildup of harmful fumes. In some models, it may also serve as a heat diffuser to help distribute warmth more evenly. This design is essential for both safety and efficiency in gas appliances.