Abstract: The present invention encompasses a modular chimney having a fireplace, a smoke chamber, and a plurality of modular blocks, forming at least one stack of blocks, the stack of modular blocks defining a chimney passage that is in fluid communication with the smoke chamber for the passage of combustion products. Alternatively, in a second embodiment, the modular chimney may also include a plurality of angled blocks, forming at least one angled stack of angled blocks, the angled stack of angled blocks defining an angled chimney passage that is in fluid communication with the smoke chamber and the chimney passage.

Abstract: The present invention encompasses a modular fireplace having a first side wall, a second side wall, and a back wall that is contiguous with the first side wall and the second side wall and defines an interior open-faced firebox region having a substantially "U" shape in top plan view. The first side wall is constructed from a plurality of sequentially stacked modular first side blocks and the second side wall is formed from a plurality of sequentially stacked modular second side blocks. The back wall has a first modular corner block, a second modular corner block, and at least one substantially vertical spacer block that are joined so that the first corner block and the second corner block are contiguous with the spacer block. To aid in the efficient drafting of the fireplace, each of the spacer blocks may have a spacer block air chamber extending therein from an open upper end on the spacer block top end to a closed lower end proximate the spacer block bottom end.