Window Technologies: Frame Types

Metal Frame	Metal Frame with Thermal Break	Non-metal Frame	Non-metal Frame, Thermally Improved
		Wood, Wood Clad, Vinyl, Hybrid, Composite	Thermally Improved or Insulated Vinyl, Fiberglass or Engineered Plastics, Thermally Improved Wood or Composite

The material used to manufacture the frame governs the physical characteristics of the window, such as frame thickness, weight, and durability, but it also has a major impact on the thermal characteristics of the window. The window U-factor, as given on the NFRC certified rating or label, incorporates the thermal properties of the frame, as well as the glazing. Since the sash and frame represent from 10 to 30 percent of the total area of the window unit, the frame properties will definitely influence the total window performance.

Glazing Types | Frame Types | Operating Types | Low-E Coatings | Gas Fills | Spacers