However, depending on the context, you could consider these options:
* Fireplace: If you're talking about a source of heat, a fireplace is a more permanent and larger structure than a brazier.
* Stove: This would be an antonym if you're focusing on the cooking aspect of a brazier.
* Modern heating system: If you're thinking about the purpose of a brazier (heating), this is a broader category but encompasses the opposite of a simple, portable brazier.
* No heat source: If you want to express the absence of heat, you could say something like "there was no brazier or other heat source."
The best antonym will depend on the specific situation and what you're trying to communicate.