This fan is already the 5th I verbaue of this type. The devices are used permanently and are in an office space. That is why I attach importance to low noise but a certain air flow. While many cheap quiet fans run quietly, but do not have the required air flow and fall after a year often whistle or squeak of bearings. The Be Quiet 2 have so far never failed or have never even been increasing in volume. Really recommended. The enclosed rubberized Entkopllungsmuffen can be mounted on either fit or 1mm distance and decouple the fan from the case.
