Planning Guides for Mailboxes


Width and height dimensions are for single boxes including assembly joint. The dimensions in the catalogue are always given in the order width x height x depth in millimetres. The system dimensions are technically subject to slight tolerances. Particularly with powder-coated articles must be expected with up to + 0.3 mm per box. Please refer to the tolerances given in DIN 6930 for stamped steel parts.

Mailbox Volume

The mailbox volume is given as a rounded value in liters. With extendable boxes, the maximum box volume is specified. The useful volume varies depending on the type of box and is on average about 70% of the total volume.

Setup Direction

In a Renz letter and parcel box system, mail and parcels are protected from wind and weather. When installing a free-standing system, however, make sure that the throw-in front does not face the weather directly, following the tradition of good craftsmanship.

Electrical Connection

Please check whether the extraction power of the standard power supply is sufficient for your planned consumption to be connected (for example for bell system, intercom, lighting control and cable length and cable cross-section).

Theft Protection

In addition to our standard pick-up safeguards, we offer special pick-offs, finger locks, reinforced doors and anti-drilling locks to further secure the contents of your mailbox. In these cases, the mailbox should be sized larger.

Optional Extras

In order to make your Renz design letterbox perfect, we offer other special designs, such as locked flap doors, various modules, special locks and much more. Ask us about it!

Aperture Opening

DIN formats There are more and more information on DIN formats, which fit in the corresponding maximum insertion opening. Here is a brief overview of the dimensions of the most common formats:DIN A5: 148 x 210 mm
A4: 210 x 297 mm
DIN A3: 297 x 420 mmDIN B5: 176 x 250 mm
DIN B4: 250 x 353 mm
DIN B3: 353 x 500 mmDIN C5: 162 x 229 mm
DIN C4: 229 x 324 mm
DIN C3: 324 x 458 mm

Water Protection

In order to achieve optimum water protection for your mail, the systems should be equipped with projecting coverings or coverings with rain deflectors; if possible, the mailbox system should be under a canopy. The mail is only protected from water if it is completely stored in the box and the flap is closed. Incorrectly inserted mail allows moisture and dirt to enter the mailbox. Therefore, it is necessary to plan sufficiently sized mailboxes for the upcoming needs. In case of increased mail volumes, we offer extra-large JUMBO mailboxes. In addition, we are happy to produce individual custom sizes.

Installation Instructions

Please note our installation instructions before fitting. Here are all notes included in detail. Download your individual assembly instructions.

Installation of freestanding mailboxes

We recommend the following concrete foundations (B25) for freestanding letterboxes. Dimensions per frame side 450 x 450 mm. Smaller systems require a continuous foundation with the following dimensions: System width + 450 x 450 mm. Depending on the soil condition, the foundation is to be enlarged. The foundation depth should be at least 800 mm, depending on the local frost limit in the ground. Prior to excavation, it is advisable to obtain a divisional plan for the planned installation site from the responsible office so that piping, electrical cables, etc. are not damaged.Each Renz booth is fitted with cable conduits and pull wires for easy electrical installation, where electrical components are installed. Please pay attention to the pulling in of the cables before concreting. If a freestanding mailbox is screwed onto a concrete foundation, heavy duty anchors (diameter 12 mm) or equivalent must be used.Mounting the system on other substrates with strength under concrete (B25) voids the warranty.

Installation of wall-mounted mailboxes

When installing letterbox systems on house walls, the relevant recommendations of the anchor manufacturer must be observed depending on the wall condition. Furthermore, make sure that no cold bridges caused by the mounting screws. Possibly. Use special dowels for wall insulation. The calculation of the total weight of the installations should be at least 4.5 kg per compartment.

Installation of flush-mounted systems

When installing systems in house walls, cold bridges can occur if the insulation layer is interrupted during installation. Especially with passive houses, we recommend installing the system either on-wall or freestanding.

Installation of Door Side Panels

In the case of heated entrance rooms, fronts with thermal break and / or insulated letterboxes should always be planned to reduce the formation of condensation. Fronts without thermal break should only be used on doors where the entrance hall is unheated (for example, an open staircase).

Installation of Mail Chutes

A transit mailbox must not be installed in walls which are heated from the inside, such as e.g. in homes with a heated staircase is the case - there is a risk of condensation!

Recommended frame heights

We recommend the following system height without floor recess: from OEFF (upper edge of finished floor) to OEB (upper edge of box):1100 mm total height up to 220 mm grid height
1200 mm total height at 221 - 500 mm grid height
1400 mm total height at 501 - 830 mm grid height
1600 mm total height at 831 - 990 mm grid height
1700 mm overall height at 991 mm and more grid heightIn case of a standing letterbox for setting in concrete, add 400 mm.
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