1, with different functions: the flue check valve is mainly used to prevent dust or small animals from entering the hood, and the check valve is used to prevent oil fume from flowing backwards.
2. Different installation positions: the check valve is generally installed at the top of the range hood, and the check valve is generally installed at the connection position between the public flue and the range hood pipeline.
3. Different installation directions: the check valve is installed vertically and the check valve is installed horizontally.