【Daily Question】Utilities - Mechanical & Electrical - 20191112
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When supervising the fabrication of ducts and components for heating systems in light industry construction projects, rectangular ducts require reinforcement measures under ( ) conditions. A. Insulated air ducts with a side length of ≤800 mm, where the length of each duct segment is less than 12 m. B. Uninsulated air ducts with a side length of ≥630 mm, where the length of each duct segment is greater than 12 m. C. Uninsulated air ducts with a side length of ≤630 mm, where the length of each duct segment is greater than 12 m. D. Insulated air ducts with a side length of ≥800 mm, where the length of each duct segment is less than 12 m. Answer: B
B. Uninsulated air ducts with a side length of ≥630 mm, where the length of each duct segment is greater than 12 m