fusion-welded sash and mainframe for added strength and rigidity
multi-wall extrusion fro superior welding strength
interlock at sash meeting rails to create a super-tight seal against air infiltration
sloped sill forces water to drain to the exterior of the windows
drop-in glazing provides energy efficiency
double barrier-in weatherstripping at sash sides helps keep out dirt and noise, and protects against air filtration
constant force balance system that eliminates sash cords, weights and pulleys
hidden screen rack produces clean lines and added beauty.