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CSI MasterFormat™ Sub-Division List |
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| CSI Code | Short Description | Extended Description |
| 04500 | Refractories |
| 045000 | Refractory Masonry |
| 045100 | Flue Liner Masonry |
| 045200 | Combustion Chamber Masonry |
| 045300 | Castable Refractory Masonry |
| 045400 | Refractory Brick Masonry |
| 04550 | Flue Liner |
| 04560 | Combustion Chamber |
| 04570 | Castable Refractories |
| 045700 | Masonry Fireplaces |
| 04580 | Refractory Brick |
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