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The HR360-3 horizontal triple-height mailbox was made for larger offices, residential apartment blocks, and multiple-occupancy government buildings. The largest model in this best-selling range, it is extremely capacious with a total capacity of just over 30 litres, and yet it measures just 360 x 330 x 255mm (width, height, depth). Designed for cavity wall and double-glazed installations, this Secured by Design letterbox is EN13724 compliant and approved for use in communal areas. Depending on the installation method chosen, the HR360-3 postbox will be delivered with either a 2mm aluminium panel or 40mm recess trim finishing surround.

    The HR360-3 rear access mailbox can be banked with other units to create a bespoke letter box bank. While typical mail bank sizes include 6 – 30 units, larger installations of 60+ units are possible.

    Schematic drawings, manufacture and just in time delivery are included as part of the Post Boxes UK Integrated Service, with no job too big or small. Please contact us for a personalised quote.


    As it can be specified for both double-glazed applications and through-wall installations, the HR360-3 horizontal mailbox is suitable for properties of any age, and so it remains a popular choice for both rural and urban environments.


    Both standard RAL and non-standard RAL colours are available for the HR360-3 multiple-occupancy letterbox. Fire extinguisher/retardant paints are available upon request.


    While our lead-times vary according to project size and complexity, we can usually deliver the HR360-3 multiple-occupancy letterbox within 4 weeks of receiving your order. Please contact us to check current lead times and discuss your project.

SKU: HR360-3

  • Material
  • Support Legs
  • Numbering / Identificiation
  • Locking Options
  • Replacement Keys / Locks
  • Security
  • Model Range

Made to last, the HR360-3 front entry rear retrieval postbox is constructed in robust electro-galvanised steel. Rust and corrosion resistant, it comes with a choice of powder-coated polyester or satin stainless steel front plates.

The HR360-3 communal rear access post box can be specified with apartment numbering, nameplate inserts and identification codes upon request. The aperture flap and the rear door can be customised with engraving, with numerous fonts available.

To prevent post-theft, the HR360-3 in-front out-back letterbox is supplied with a non-mastered cam lock by Eurolock. Upgraded locks are available upon request.

Post Boxes UK offers replacement keys and replacement locks for the HR360-3 large-capacity post box. We offer bulk discounts for student accommodation managers, property developers, and management companies, and can supply you with any number of spare keys and locks.

The HR360-3 triple height mailbox is fully compliant with EN13724 and the Secured by Design police initiative. It has an anti-fishing device to prevent tampering via the aperture, and it meets all the requirements outlined in the Homes Guide 2016.

Upon request, we can supply the HR360-3 door panel letterbox with an integrated intercom system. This includes intercom housing, a speaker grille, and illuminated or non-illuminated push buttons. Alternatively, if you have an existing intercom or video panel, we can incorporate this into the front plate of the postbox. Please contact us.

The HR360-3 is the largest mailbox in our best-selling HR360 range. Designed for busy environments and communal reception areas, it can be installed into any cavity wall or double-glazed panel, where it will serve as a stylish and secure receptacle for mail delivery. With an anti-fishing aperture, this premium postbox can reduce the chance of post-theft in high-risk areas, and it can easily accept A4 size envelopes to make life easier for postal delivery workers.

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