Make sure ductwork is insulated.

确保管道系统是绝缘的。

A method of assembling HVAC ductwork components is described.

描述了一种组装HVAC管道系统部件的方法。

The method includes the step of coupling together first and second ductwork components.

该方法包括将第一和第二管道系统部件连接在一起的步骤。

Multileaf dampers are used to isolate and restrict the airflow in ductwork and other openings.

多叶阀主要用于通风空调系统中的风量调节和压力控制。

The performance of electric actuator is very important for the controlling of electric valve, even for the ductwork.

电动执行装置性能的好坏，对电动阀门甚至整个管道系统的控制都具有十分重要的影响。