| Masonry | Brick, Masonry |
| BrickLineWTiles | Brick-lined with Fire-proof Tiles |
| CBL | Cement Block |
| Concrete | Concrete |
| Fct2WallChimIns | Factory Built Double Walled Metal Chimney Insert |
| MasonryWLiner | Masonry, With Liner |
| MasonWOLiner | Masonry, Without Liner |
| MetalDoubleWall | Metal, Double Wall Insulated (Class A and Underwriters Laboratory Listed) |
| MetalSingleWall | Metal, Single Wall (Class A and Underwriters Laboratory Listed) |
| MetalTripleWall | Metal, Triple Wall (Class A and Underwriters Laboratory Listed) |
| NO | None |
| Other | Other |
| 1 | Pipe, Metal |
| PrefabNForWood | Prefabricated, Not To Be Used With Wood Combustion |
| Prefab4Wood | Prefabricated, To Be Used With Wood Combustion |
| PrefabCertified | Prefabricated and Certified (ULC, CSA, ACNOR, WH) |
| STN | Stone |
| 2 | Stone, Cement |
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