请注意:此版本的所有临时修订版将在您购买时提供。燃气、燃油或固体燃料燃烧设备的热回收装置UL 4621范围1。1这些要求包括热回收装置，旨在从燃气、燃油或固体燃料燃烧设备的烟气中回收部分热量，用于加热空间或水。它们用于安装在用于连接B型或L型通风口或金属或金属烟囱的器具的通风口或烟囱接头上。热回收器的最高烟气温度不超过1000°F（538°C）。1.2热回收器拟由合格机构根据制造商的说明和烟囱、壁炉、通风口和固体燃料燃烧设备标准NFPA 211或国家燃气规范进行安装，NFPA 54/ANSI Z223。 1.1.3这些用于连接电源的热回收器的额定电压应为240伏或更低，并根据国家电气规范NFPA 70.1.4中普通位置的要求进行安装，包括管道连接的热回收器应根据适用的管道规范进行安装。

Please note: All interim revisions for this edition available at time of your purchase will be included.Heat Reclaimers for Gas-, Oil-, or Solid Fuel-Fired AppliancesUL 4621 Scope1.1 These requirements cover heat reclaimers which are intended to recover a portion of heat from the flue gases of gas-, oil-, or solid fuel-fired appliances for the purpose of heating space or water. They are for installation on the vent or chimney connectors of the appliances which are for attachment to a Type B or Type L vent or a metal or masonary chimney. The heat reclaimers are covered for the maximum flue gas temperature marked on the heat reclaimer, which does not exceed 1000°F (538°C).1.2 The heat reclaimers are intended for installation by a qualified agency in accordance with the manufacturer's instructions and the Standard for Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances, NFPA 211 or with the National Fuel Gas Code, NFPA 54/ANSI Z223.1.1.3 These heat reclaimers intended for connection to an electrical supply are to be rated 240 volts or less, and are for installation in accordance with the requirements for ordinary locations in the National Electrical Code, NFPA 70.1.4 Heat reclaimers which include plumbing connections are to be installed in accordance with the applicable plumbing codes.