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定价: 7462元 / 折扣价: 6343

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1.1 Scope 1.1.1 This standard applies to newly produced, large automatic storage water heaters having input ratings above 75,000 Btu per hour (21 980 W), instantaneous water heaters, circulating water heaters, including booster water heaters (see Part

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定价: 5460元 / 折扣价: 4641

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Scope Details test and examination criteria for unvented heaters for use with natural, manufactured and mixed gases, liquefied petroleum gases, and LP gas-air mixtures. Such heaters are limited to Maximum input ratings of 40,000 Btu per hour

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Addenda to American National Standard Z21.12-1990 for Draft Hoods. Approved April 23, 1993 by American National Standards Institute, Inc. NOTE: Changes, other than editorial, are denoted by a vertical line in the margin.

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Addenda to American National Standards Z21.12-1990 and Z21.12a-1993 for Draft Hoods. Approved February 14, 1994 by American National Standards Institute, Inc. NOTE: Changes, other than editorial, are denoted by a vertical line in the margin.

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定价: 5551元 / 折扣价: 4719

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Scope Details test and examination criteria for manually operated gas valves which are substantially of the plug and body, or rotating disc type, and to valves of other types which will provide equivalent performance. The standard presents minimum lev

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ANSI Z21.18-07/CSA 6.3-07 Gas Appliance Pressure Regulators 现行 发布日期 :  实施日期 : 

定价: 3731元 / 折扣价: 3172

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Scope Details test and examination criteria for gas appliance pressure regulators for use with natural, manufactured and mixed gases, liquefied petroleum gases and LP gas-air mixtures. Such devices, either individual or in combination with other contr

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定价: 592元 / 折扣价: 504

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定价: 546元 / 折扣价: 465

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