《国家燃气规范》采用的新排气指南解决了与最近引进的风扇辅助燃气用具有关的大多数排气问题。然而，对于不在新指南范围内的改装装置，需要进行额外的分析，以确保适当的通风措施和无故障运行。新的排气指南有助于为分析提供指导。现场经验对指导分析也很重要。VENT-II计算机程序用于生成新的排气口尺寸指南，也是分析独特排气情况的合适工具。给出了所需分析类型的示例。关键词:计算机程序、法规、燃气装置、现代化、通风口、风扇、燃气锅炉、锅炉、燃气、电器、尺寸、燃烧气体、烟气。引文:研讨会，ASHRAE交易1993，第卷。 第99页。1.

The new venting guidelines adopted by the National Fuel Gas Code resolve the majority of venting problems associated with the recent introduction of fan-assisted gas appliances. For retrofit installations that fall outside the scope of the new guidelines, however, additional analysis is required to ensure proper venting action and trouble-free operation. The new venting guidelines can help provide guidance as to what to look for in the analysis. Field experience is also important in guiding the analysis. The VENT-II computer program, which was used to generate the new vent sizing guidelines, is also an appropriate tool for analysing unique venting situations. Presents an example of the type of analysis required.KEYWORDS: computer programs, regulations, gas installations, modernising, vents, fans, gas fired boilers, boilers, gas, appliances, sizing, combustion gases, flue gases.