All Z frames can be ordered with Sill Plates. A Sill Plate is used when you need to fit your frame down onto a window sill. The overlapping part of the Z frame is removed so your left with a flat frame that can be fixed down into the window sill. Sill Plates are ideal if you want to use Tposts or large windows, they make fitting Z frames much easier as you get support and magnets all around the frame. The Sill Plate is still mitred at the corners and is connected using the Hoffman keys.
Sill Plate Technical Drawing
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