Product review (5 stars): AKDY range hood support
There is nothing wrong with a range hood at this price that looks pretty good. It is noisy at full blast. I thought by adding mass between the fan and the kitchen behind the stainless steel cover would reduce direct sound transmission, but the noise is coming through the inlet. The only way to reduce that is to add distance between the inlet and the fan and include acoustic lining. Acoustic lining and grease unfortunately do not go hand in hand. So, putting a different fan on the roof by extending the power wiring and ductwork may be an option, but I am not sure if I want to do that now that it is still too cold outside.
The suspension of the unit from the wall could be a challenge, as the suspension holes are 20 cm apart and a typical wall has studs at 41 cm spacing (16"). I used a 3 mm thick sheet metal wide enough to fit inside the stainless steel cover as high as 25 cm, attached to the stud at 5 cm spacing vertically. To ensure the metal stays against the gypsum board wall I attached this to the gypsum board wall with one anchor. Perhaps glue will do too. If you do not have one stud behind the stainless steel cover, you will have to open the gypsum board and add a horizontal 2x4 piece nailed to the studs and patch the wall smooth. In my case I have barely 10 mm of the studs to screw onto.
The 15 cm plastic round duct transition piece is IMHO too small for the air flow. I am having a sheet metal transition made to 20.3 cm round (8"). Then I have barely 40 cm above to go out the back wall with a grille of 20x22 cm at an acceptable exit air velocity under normal operating condition (not maximum speed). The transition duct will also have to avoid the electrical plug. If I have a chance, I will post a picture of the entire wall support thing.