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Post Boxes | Letter Boxes | Mailboxes | Post Boxes UK

H300 3 Extra Large Capacity Mailboxes Letterbox Postbox

H300 3 Extra Large Capacity Mailboxes Letterbox Postbox

The H300-3 extra large / high capacity mailbox is the triple height version of our best selling horizontal commercial mailbox model H300-1. This large volume post box conforms to EN13724 (accepts A4 post, anti-pilfer baffle to aperture) and is also Royal Mail approved. It is available in any RAL powder coat finish (100% polyester) and brushed (satin) stainless steel, and comes with a high security Eurolock cylinder (500 differs).

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It has dimensions of 300mm width, 330mm height and 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 H300-3 is designed to be incorporated into a bank of multiple letterboxes but is also suitable as an individual stand alone mailbox.

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 H300-3 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 post boxes.


  • Horizontal post box suitable for internal or external use, either wall mounted, wall recessed, or free standing on support legs.
  • Dimensions per unit: 300 x 330 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).
  • Secured By Design compliant (clauses 21.19 and 24.6) where applicable.
  • Anti arson / fire proof compatible.
  • Manufactured and bank-assembled in Europe.
  • 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 security flap to inner aperture.
  • Hinged to right, side opening.
  • 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 letter box 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 24 multiple mailboxes in a six wide four high configuration (6w 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 H300-3 commercial extra large / high capacity mailbox 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.

Price: POA Email Your Enquiry