There are six dampers, which are double louver type and which are equipped with the seal air system.

有六块档板，都是双挡板并带有密封空气系统。

youdao

There are six dampers, which are double louver type and which are equipped with the seal air system.

有六块档板，都是双挡板并带有密封空气系统。

youdao