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Posted: 10/31/2007 7:40:41 AM
Most of the time you use a single cylinder deadbolt -- a key on the outside a knob to turn on the inside. Sometimes you add a double cylinder (the inside must be opened with a key too) -- when it's near a window. That way someone can't break the window and reach in to gain entrance. You need to check fire codes before you install, however.
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