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The EN 13724:2002 “Postal services – Apertures of private letter boxes and letter plates – Requirements and test methods”, European standard for letterboxes specify that:

  • an envelope of C4 (229 mm × 324 mm) size must be deliverable without bending or damage;
  • the internal volume must able to hold at least a 40 mm high bundle of envelopes;
  • the height of an aperture is 30–35 mm;
  • the width of the aperture is either 230–280 mm (for C4 width) or 325–400 mm (for C4 height);
  • the mounting height of the aperture should be between 0,7 and 1,7 m.