Operable sash move smoothly with a constant force coil spring balance system that never needs adjustment.
On Double Hung windows, sash slide easily up or down due to a constant force coil spring balance system.
Interlocking design of the meeting rail on Double Hung windows securely fastens sash together.
To assist with quick
installation, Series 400
windows are available
with wood or Quick
Trim™ cellular pvc jamb
extensions. Choose either 4-9/16″ or 6-9/16″
The U-channel spacer system, more efficient than conventional spacers, moderates outside air before it hits the inside sash.