excellent... but not perfect

As you would expect for the price this item is a powerful and efficient extractor. Even the auto feature seems to work quite well. However, the installation instructions were rudimentary and not specific to this model. The bracket to hold the flue duct in place can only be mounted on the wall which is fine unless your existing exhaust duct hole is right where the bracket is supposed to be and you have to bodge something together with small blocks of wood. A simple alteration to the bracket design would give the option to mount the bracket on the wall or ceiling which would be fine since the flue duct is not heavy.