My hood is too noisy

If the noise is mechanical, remove any pipe connected to the hood and check that anything dropped inside the motor that could comes into contact with the fan blades.

If the noise is not mechanical, disconnect, if present, the duct out pipes from the hood, turn on the fan and check if the situation improves. If it improves the problem can be solved by analyzing the installation. If the hood is in recirculation mode, remove the charcoal filters and see if the situation improves.

A louder noise is normal with charcoal filters installed.