Violation of installation technology. The design of these hoods is quite simple, there are all the necessary installation accessories for the extract of 90 in the supply kit, however, non -compliance with the requirements of the installation instructions lead to the fact that this device makes too much noise when working. Such a problem may not occur due to structural flaws of the product, but, for example, in the case of installation of an air duct with a lesser with a diameter. The small diameter of the box or duct creates additional interference with the thrown air, which, running into obstacles and creates some vibration and noise. It should also be borne in mind that when installing a corrugated air vent, more resistance is created for an outflow of air than when using a duct with smooth walls.
