Ventilation for buildings - ductwork - dimensions of circular flanges for general ventilation .

建筑物通风管道系统一般通风用圆法兰盘的测定。

But even taping and insulating just the ductwork you can access easily will make a difference .

但起码密封和隔热工作做起来十分容易，这将带给你不一样的感受。

They replaced ties , track , ductwork and strung almost 100 hundred kilometers of cable .

他们替换了各种设施，包括管道系统和近1万公里长的电缆。

Study on control system of pneumatic conveying in complicated ductwork .

复杂管网气力输送控制系统的研究。

The installation of technology distribution , compressed air and cooling water ductwork refers to the similar project our company has done before .

工艺配电及压缩空气、冷却水管道系统的安装参照我公司以往类似工程。