What dimensions should mail slots for standard mail have?

The dimensions for mail slots for standard mail can vary, but there are general sizes that are usually used to ensure that different letter and envelope sizes fit through the slot easily.

First, there are the dimensions for private use. The following applies to the cross-section:

• Minimum height: 30 - 35 mm
• Minimum width: 230 - 330 mm

The width is designed so that a standard DIN C4 envelope (229x324 mm) fits through comfortably. The minimum height of 30-35 mm also allows thicker letters or smaller parcels to be inserted.

For commercial use, such as in office buildings or similar facilities, larger dimensions are typically used:

• Minimum height: 40 - 50 mm
• Minimum width: 250 - 400 mm

These dimensions allow greater capacity and flexibility for different types of mail. However, you should always check the specific requirements and regulatory specifications in your country before installing a mail slot.