![]() The ensure that the document or envelope is not damaged or compromised, the aperture should not have any sharp edges.The letter flap of the mailbox must be easily opened and be self-closing.Special circumstances allow aperture heights to be between 400mm and 1800mm from delivery floor level. The height of the lowest mailbox aperture should be no lower than 700mm from delivery floor level and the height of the highest mailbox aperture be no higher than 1700mm from delivery floor level.The height of the aperture must be between 30mm and 35mm.Relating to volume, the size of the mailbox must be able to hold a 40mm high/thick pile of documents or envelopes.And for C4 side way deliveries, the aperture of the mailbox must be a minimum of 325mm and a maximum of 400mm width.The aperture of the mailbox therefore must be a minimum of 230mm width and a maximum of 280mm for C4 length way deliveries.A C4 envelope or document (324 x 229mm) should be able to be delivered without having to bend, fold or damage the document in any way.So here are the main criteria for a mailbox set out by the European Norm 13724 standard: In reality once a C4 envelope is filled with paper, its dimensions shrink a little. That is 12.8 x 9 inches in imperial dimensions.īut specifically, for test methods, the C4 envelope must be 24mm thick (height) containing flat A4 paper 80gm sheets. And it concerned mainly with the ability of a mailbox to accept a C4 envelope and keep it safe. Without doubt the most common question relating to EN13724 mailboxes and letter boxes. This is a European standard set out to ensure that a mailbox meets certain requirements with respect to accepting letters and keeping those letters safe. Most of the mailboxes for sale nowadays that can be found on the internet conform to EN13724. ![]()
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