Profile: Rivertown Window Mfg. manufactures system boreal windows and door products. Our product line includes double hung, 2 lite sliders, patio sliders, casement & awning windows and PVC frame entry doors. Our double-hung windows include hurricane-worthy double-hung windows, PVC multichambers, interior glazing beads, most internal chambers, full-size, double-walled handle beads and sash retainer & mounting hardware.