Brown Windows installed 7 windows across the back of our house a number of years ago. Within the first couple years 3 of the seals failed resulting in grayish discolouration around the perimeter of the window. They replaced those at a partial cost to me. Since then all of the windows have failed. And they wouldn't do anything about it. Apparently the spacers they used between the panes of glass were inferior. Since they knew that I think they should have been willing to replace the other windows. The worst quality windows I have ever seen.