矩形风管止回阀

产品描述：

矩形风管止回阀水平安装在风管或空调管道中，当风机停转时，防止气体倒流，起到单向止回的作用，但要求风管中风速不能小于8m/s。

Product description:

The rectangular duct check valve is installed horizontally in the air duct or air-conditioning duct. When the fan stops, it prevents the gas from flowing back and plays a single-side check role, but the wind speed in the air duct is required to be no less than 8m/s.