Kasson and Keller Windows

[Rpr444]

Have a new family room construction. Contractor installed windows
labled Kasson and Keller Series 200. Some are 29.5 inches wide and
others about 33.5 inches wide. All are 56.5 inches high.

Does anyone know where I can get window screens for these windows?

The channel looks to be fairly narrow. Can't even use screen building
kits found in home supply stores. Looks like the screens are less than
5/16 inches.

Thanks