And it can change cutting length follow to different size of fire damper optionally.

并且可以根据阀体的大小，随意调节叶片长度，定尺切断。

youdao

And it can change cutting length follow to different size of fire damper optionally.

并且可以根据阀体的大小，随意调节叶片长度，定尺切断。

youdao