UL 441 Ed. 9 标准详情
- 标准号:UL 441 Ed. 9
- 中文标题:气体排放口
- 英文标题:Gas Vents
- 标准类别:美国保险商实验室UL
- 发布日期:
Gives Types B and BW vents and Types B and BW vent roof jacks for venting gas appliances equipped with draft hoods to burn only gas. Type B vents are also intended for use with other Category 1 appliances that specify they are for use with Type B ven
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