Original review updated by user Aug 04, 2021 Screens allow so many bugs and gnats in, that windows can never be opened. If you should have your windows open and a light on in the room, so many gnats rush into the room that they have set off the smoke detector 5 times so far, always in the middle of the night. The window area is always filthy with dead bugs. Windows are 2 years old. User's recommendation: Stay away from Marvin.