Core TradesCâu 35 / 700
Flexible air ducts must be supported at MAXIMUM intervals of about what distance to prevent excessive sagging?
a.18 inches
b.3 feet
c.4 feet
d.10 feet
Giải thích
Flexible duct is typically supported at intervals not exceeding about 4 feet, limiting sag to roughly a half-inch per foot between supports. Closer spacing is unnecessary and 10 feet would allow excessive sag that restricts airflow.
Trích dẫn luật: 2025 CA Mechanical Code (CMC) §603 (Air Ducts)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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