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Post Boxes | Letter Boxes | Mailboxes | Post Boxes UK

HR300 1 Through Wall Letter Boxes Post Box Mailbox

HR300 1 Through Wall Letter Boxes Post Box Mailbox

HR300-1 through wall letter boxes with dual access (in-front out-back) are our standard rear retrieval units perfect for through wall (cavity wall), though railings or glazed door entrance applications.

This dual access post box conforms to EN13724 (can accept A4 mail without having to fold or bend the post, and has an anti-theft baffle), and is also Royal Mail approved. With is 380mm depth, the HR300-1 can be installed through a cavity wall and any projection internally can be finished with an appropriate casing or surround.

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It has dimensions of 300mm width, 110mm height and 380mm depth, and is a front-entry rear-retrieval unit (in-front, out-back). Where applicable, it complies to Secured by Design Homes Guide 2016 in chuted format.

HR300-1 through wall letter boxes are designed to built into a bank of multiple postboxes - we would recommend that the smallest bank size be 6 units (2 wide 3 high), but can go up to larger bank sizes of approximately 50 units.

The HR300-1 is available in any RAL finish, many of which are in-stock. It is also available in any other RAL finish for which there is a small additional charge. Gloss levels can also be specified as required. It is also available in (brushed) satin stainless steel.

The H300-1 rear access letter box has a high security Eurolock cylinder and each unit comes complete with 2 keys. Additional keys can be requested at the time of order.

It is available with a one piece front plate in 2mm thickness (for through wall post boxes systems) or a 24mm thermally bridged one piece front plate, which is designed to replace a double glazed unit, held in place by the glzing profile. 

The model HR300-1 can also be fitted with an internal fire extinguisher thus creating a fire proof letter box system.


  • Manufactured and bank-assembled in Europe.
  • Through wall letter boxes with dual access suitable for through wall, through / in railings, and in glazed door entrance application.
  • Dimensions per unit: 300 x 110 x 380mm (width, height, depth).
  • Aperture size: 265 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 galvanised steel, flap manufactured from cast aluminium.
  • High / large capacity versions available – model HR300-2 (220mm height) and HR300-3 (330mm height).
  • Each mailbox comes complete with 2 keys (500 differs). Additional mailbox keys available at time of order only.
  • Secure postbox, with 1.2mm thick steel doors, high quality Eurolock lock and extra wide security flap to inner aperture.
  • Hinged to right, side opening.
  • Available in any RAL colour of choice (door and flap only) – please see our RAL colour chart. Also in brushed (satin) stainless steel marine grade 316.
  • Numbering and lettering to flap can be specified for an additional charge.
  • Choice of surrounds and support legs depending upon type of application.
  • Blank plate (without flap) can be specified for uneven bank configurations.
  • Post Boxes UK recommends a maximum single unit bank size of 50 through wall letter boxes in a five wide ten high configuration (5w 10h). Should you wish to specify a larger bank size than this, please call us on +44 (0)1922 218218 to discuss.


Should you require any further information regarding HR300-1 through wall 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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