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Post Boxes | Letter Boxes | Mailboxes | Post Boxes UK

H400 3 Horizontal Post box Letter box Mailbox

H400 3 Horizontal Post box Letter box Mailbox

The H400-3 extra large / high capacity mailbox is the triple height version of our model H400-1 postbox. This large volume unit conforms to EN13724 (accepts A4 post, has an anti-pilfer baffle to aperture) and is Royal Mail approved. It is available in any RAL powder coat finish (100% polyester) or stain (brushed) stainless steel, and comes with a high security Eurolock cylinder (500 differs). Given the size of this mailbox it is best suited to commercial applications such as offices or storage facilities.



It has dimensions of 400mm width, 330mm height and a standard depth of 270mm (also available with an extended 380mm depth), and is a front-entry front-retrieval unit (in-front, out-front). Where applicable, it complies to Secured By Design requirements (clauses 21.19 and 24.6).

The model H400-3 is designed to be incorporated into a bank of multiple letterboxes but also works well an individual stand alone letterbox.

It can be installed and used as both a bank of internal mailboxes or external mailboxes with a choice of different casings, surrounds and support legs.

The model H400-3 can also be fitted with an internal fire extinguisher. This is a much more economical solution to specifying a bank of similar sized fire rated letter boxes.


  • Horizontal mailbox suitable for internal or external use, either wall mounted, wall recessed, or free standing on support legs.
  • Dimensions per unit: 400 x 330 x 270/380mm (width, height, depth).
  • Manufactured and bank-assembled in Europe.
  • Aperture size: 355 x 35mm. Conforms to EN 13274 (accepts A4 envelope without having to fold or bend; anti-theft flap to inner aperture).
  • Mailbox body and door manufactured from steel, flap manufactured from cast aluminium.
  • Secure postbox, with 1.2mm thick steel doors, high quality Eurolock lock and extra wide anti-fishing security baffle to inner aperture.
  • Hinged to right, side opening.
  • Secured By Design compliant (clauses 21.19 and 24.6) where applicable.
  • Anti arson / fire proof compatible.
  • Available in any RAL colour of choice – please see our RAL colour chart. Also available in marine grade 316 (satin) brushed stainless steel.
  • Each mailbox comes complete with 2 keys (500 differs). Additional mailbox keys available at time of order only.
  • Choice of surrounds and support legs depending upon type of application.
  • Numbering and lettering to flap can be specified for an additional charge.
  • Wide selection of accessories available including signage, lighting and shelters.
  • Blank door (without flap) and parcel shelf system can be specified for uneven bank configurations.
  • Post Boxes UK recommends a maximum single unit bank size of 20 multiple letter boxes in an five wide four high configuration (5w 4h). Should you wish to specify a larger bank size than this, please call us on +44 (0)121 288 0838 to discuss.


Should you require any further information regarding H400-3 multiple letter boxes or wish to discuss your enquiry, please call Post Boxes UK today on +44 (0)121 288 0838. Alternatively, your enquiry can be emailed to and where possible, we would that drawings be sent in pdf format. Thank you.

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