FLUSH FIN OR BLOCK? The next thing to determine is the type of replacement application you need. Flush Fin (also known as Z-Bar) frames are designed to replace aluminum or other metal frame windows while preventing damage to stucco and interior dry wall. It consists of a vinyl fin that surrounds the perimeter of the window frame and is flush with the exterior frame of the window. Block frames are designed to replace old wood sash windows. They contain a sloping sill adapter which provides a clean, tight fit to the old wood sill of your existing window frame. Because this type of window does not include a full perimeter fin, it usually requires a new finished trim application. The Next Step: Selecting a Glass Type Back to Replacement Windows Click Image to Zoom in
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