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Nominal dimensions are the theoretical sizes used for identification purposes, which may not reflect the actual measurements of the material. Generally, nominal dimensions in construction and material specifications can vary by a tolerance amount to account for manufacturing processes and material properties. A variation of 1/2" is commonly accepted as a reasonable tolerance in the industry, ensuring that the material will still fit and function as intended, while allowing for slight discrepancies in measurement.

Understanding that nominal dimensions can have such tolerances is crucial for professionals in the chimney and building trades. It helps them anticipate potential issues when installing components, ensuring that fittings are effective and meet safety standards. This variation is particularly relevant in chimney construction, where proper fitting and alignment are critical for performance and safety.