Core TradesCâu 145 / 700
A fuel-burning furnace located in a confined space requires combustion-air openings primarily to:
a.Reduce operating noise
b.Cool the furnace cabinet
c.Supply oxygen for complete combustion and prevent carbon-monoxide buildup
d.Raise the appliance efficiency rating
Giải thích
Combustion-air openings provide the oxygen the burner needs for complete combustion; without enough air, incomplete combustion produces dangerous carbon monoxide. The openings are not for noise reduction, cabinet cooling, or raising the efficiency rating, which is set by the appliance design.
Trích dẫn luật: 2025 CA Mechanical Code §701.0Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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