Ordered dinner at 22:03:15 and delivered at noon on 3/30/15. Delivery could be a little faster. Regardless installed, so part and connected. Running sound very pleasant, but not 25 dB but measured by cell phone 55 dB. Nevertheless, no comparison to the 14 year old ..... M fans. (About 65 dB) hum or whine No more of this annoying. The air capacity of the Quiet 100 is also significantly higher. (Measured with a piece of paper in front of the opening) I have set it with maximum delay 2 minutes and 15 minutes stopping time. The optics-quality from the pictures. Ah yes, the non-return valve back a piece of foil which pushes in operation. If I do not care, because not needed. It can be fixed with 4 screws. (Screws are included) attached two screws diagonally but are perfectly adequate. All in all, highly recommended!
