S21-SF (Simple Face) - 105s[21] A perfect pairing of architecture and fire Stv 21 wood fireplaces are manufactured to blend into the decor, the fire becomes the center of attraction. These modern fireplace models also feature a retractable window that can be raised or lowered for an open or closed fire. Frameless guillotine glass window Stv 21 wood fireplace models have a guillotine glass window. There is no frame at the bottom to affect the view of the fire. Single or double