1.Where is a Pittsburgh joint used?
1.匹兹堡接头用于何处？
2.Purpose of a register?
2.出风口的作用是？
3.Triple-walled metal chimney regulations?
3.三层金属烟囱的规范依据是？
4.Drain for a water heater pressure relief valve?
4.热水器压力安全阀的排水管应如何处理？
5.Purpose of a condenser line for a furnace vent fan?
5.供暖炉通风扇的冷凝水管作用是？
6.Which applies to water heaters?
6.哪些适用于热水器？
7.When does a contractor provide a water heater warranty?
7.承包商何时提供热水器保修？
8.Common name for a Freon recovery unit?
8.氟利昂回收装置的常用名称是？
9.Minimum clearance from water heater top to ceiling?
9.热水器顶部到天花板的最小间距是？
10.Minimum framing for R-19 insulation?
10.R-19 隔热材料的最小框架尺寸是多少？
