: Decide on the height and center the slot horizontally on the door. Wikipedia notes that these are typically cut through the middle or lower half of the door. Use the provided template (or the hardware itself) to trace the cutout area.
I recently had a mail slot installed on my front door, replacing an old, rusted wall-mounted mailbox. Overall, I’m very happy with the result, but the installation process had a few important lessons.
It will shatter.