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Post Boxes | Letter Boxes | Mailboxes | Post Boxes UK

H300 16 Secure Large Capactiy Letterbox Mailbox Post Box

H300 16 Secure Large Capactiy Letterbox Mailbox Post Box


The H300-16 is the larger version of one of our biggest selling of all the horizontal apartment mailboxes in the UK. These multiple occupancy mailboxes are also known as a space saving units, and the H300-16 is suitable for both small scale apartment and flat projects and the largest of multi-use developments.


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This horizontal post box has dimensions of 300mm width, 165mm height and 380mm depth, and has become an industry standard across Europe for high density residential schemes requiring a higher capacity unit. It is a front-entry front-retrieval letter box (in-front, out-front) and conforms to EN13724 (accpets A4 mail without having to fold or bend the envelope, has anti-theft baffle to aperture) and is Royal Mail approved. It also complies with Secured By Design's New Homes Guide 2014 (sections 21.19 and 24.6) being of robust construction and with anti-fishing properties.

The model H300-16 is designed to incorporated and assembled into large banks of mailboxes - typically, from small banks of 6 units up to larger banks of 300+ units. As such the model H300-16 post box is most suited to large scale city centre residential schemes and student accommodation projects.

The H300-16 is available in any RAL finish, many of which are stock finishes. Non-stock finishes incur a small surchage for small orders. Gloss levels can also be specified as required. It is also available in (brushed) satin stainless steel.

It is suitable for both internal and external use with a choice of different casings, surrounds and support legs.

The model H300-16 can also be fitted with an internal fire extinguisher.


  • Manufactured and bank-assembled in Europe.
  • Apartment mailboxes suitable for internal or external use, either wall mounted, wall recessed, or free standing on support legs.
  • Dimensions per unit: 300 x 165 x 380mm (width, height, depth).
  • Aperture size: 260 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.
  • Each mailbox comes complete with 2 keys (2000 differs). Additional letter box 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 available in satin (brushed) stainless steel.
  • Numbering and lettering to flap can be specified for an additional charge.
  • Secured By Design compliant, New Homes Guide 2014 (sections 21.19 and 24.6).
  • Anti arson mailbox / fire proof compatible.
  • Choice of surrounds and support legs depending upon type of application.
  • Blank door (without flap) and parcel shelf system can be specified for uneven bank configurations.
  • Post Boxes UK recommends a maximum bank size of 54 apartment mailboxes in a six wide twelve high configuration (6w 9h). 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 H300-16 secure high capacity letterboxes 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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