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CMU Fire Resistance Calculator

The NCMA CMU Fire Resistance Calculator is a spreadsheet-based calculator tool that determines the fire resistance rating of concrete masonry wall assemblies. The tool can be used to determine the fire resistance rating of a wide variety of CMU walls, including those with finishes on one or both sides. Multi-wythe assemblies can also be evaluated. Calculations are based on the requirements in ACI/TMS 216.1, Code Requirements for Determining Fire Resistance of Concrete and Masonry Construction Assemblies.