近年来，炉子制造商一直在开发新的、效率更高的I类炉子，这些炉子没有通风罩或通风分流器，而是使用风扇辅助燃烧系统。这些熔炉仍然依靠热燃烧产物浮力产生的自然气流来排放烟气。介绍了用于为带有风扇辅助燃烧系统的I类设备生成通风指南和表格的标准。这些通风指南和尺寸表基于限制连接至I类风机辅助设备的通风系统的冷凝和加压。该指南涵盖了单个一类风机辅助设备的通风，或一类风机辅助设备和通风罩辅助设备在同一楼层的任何组合的通用通风。关键词:开发、通风、容积、锅炉、燃气锅炉、风机、燃烧、自然通风、烟气、法规、尺寸、冷凝、增压、排气罩。 引文:研讨会，ASHRAE交易1993，第99卷，pt。1.

In recent years furnace manufacturers have been developing new, higher efficiency Category I furnaces that do not have draught hoods or draught diverters but instead use fan-assisted combustion systems. These furnaces still rely on the natural draught created by the buoyancy of the hot combustion products to vent the flue gases. Presents the criteria used to generate venting guidelines and tables for Category I appliances with fan-assisted combustion systems. These venting guidelines and sizing tables are based on limiting the condensing and pressurisation of a vent system attached to a Category I fan-assisted appliance. The guidelines cover either the venting of a single Category I fan-assisted appliance or the common venting of any combination of Category I fan-assisted and draught-hood-equipped appliances on a single floor.KEYWORDS: developing, vents, volume, boilers, gas fired boilers, fans, combustion, natural draughts, flue gases, regulations, sizing, condensation, pressurisation, exhaust hoods.