Thiết bị & Bình nước nóngCâu 187 / 360
A fuel-gas water heater installed in a small closet requires combustion air primarily to:
a.cool the discharge pipe
b.supply oxygen for safe, complete combustion and proper venting
c.increase the water temperature
d.pressurize the expansion tank
Giải thích
A gas burner needs adequate combustion air so fuel burns completely and does not produce dangerous carbon monoxide. Insufficient air also causes poor draft and backdrafting of flue gases. Confined spaces must be provided with openings or ducts sized for the appliance input.
Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A house has a water meter with a check valve installed on the service. What must be added at the water heater to control thermal expansion?
- Thermal expansion in a domestic hot water system is primarily caused by:
- A gas water heater is installed in a residential garage. To reduce the risk of igniting flammable vapors, the ignition source should generally be elevated above the floor by at least:
- An atmospherically vented gas water heater relies on which principle to move flue gases out of the building?
- Under current California requirements, a new residential water closet may use a maximum flush volume of:
- The maximum flush volume allowed for a new urinal (other than wall-mounted) in California is generally:
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