How Big Should Mail Slots Be?

The size of a mail slot is dictated by the size of the door or wall in which it is installed. Mail slots are usually installed in an exterior door or wall, so that the mail can be delivered directly into the home or office.

The slot must be large enough to accommodate the largest piece of mail that will be delivered, without being so large that it compromises the security of the door or wall.

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Most mail slots are between 3 and 4 inches wide, and 6 to 8 inches tall. Some slots are as small as 2 inches wide and 4 inches tall, while others are as large as 5 inches wide and 10 inches tall.

It is important to consult with a professional when installing a mail slot, to ensure that it is properly sized for the door or wall in which it will be installed.