商业和轻工业供暖、通风和空调系统的基本管道系统设计手册。包括风机入口和出口的系统影响、管道中的噪声控制以及抽风机、碎片和阻尼器的使用。新的损耗系数适用于方跟和半径跟的45度喉部肘部和方跟的半径喉部。在某些情况下，与带双壁旋转叶片的弯头相比，损失更大。其结构旨在为设计师提供节能设计方法、材料和结构方面的选择。包括软指标。

A fundamental duct system design manual for commercial and light industrial heating, ventilating and air conditioning systems. System effects for inlets and outlets of fans, noise control in ducts and use of extractors, splinters and dampers are included. New loss coefficients for elbows with 45-degree throats on square and radius heels and radius throats with square heels. Losses compare favorably with elbows with double wall turning vanes in several cases. Structured to offer the designer options in energy-efficient design methods, materials and construction. Includes soft metrics.