12.7.1 Windows on the reverse For Letter format Mailing Items only, a maximum of one window is permitted on each face i.e. one on the front and one on the back.
You are recommended to leave a clear zone on each Mailing Item where we can apply a unique tag code. For landscape Mailing Items this area starts 60mm from the bottom edge up to 10mm high, stretching 100mm from the right hand edge. Portrait Mailing Items should be rotated to be landscape with the Indicium in the top left hand corner and the tag code clear zone is as set out for landscape Mailing Items. We also recommend that you leave a clear zone that starts from the bottom edge up to 18mm high, stretching to 130mm from the right edge. 13. Mailmark Large Letter Requirements The recommendations and requirements set out in this sections 13 are additional to the recommendations and requirements already set out in sections 1 – 11 and section 14 but are specific to Large Letter format Mailing Items. You should prepare your Mailmark Large Letter format Mailing Items in line with sections 1 – 12 and section 14. Getting started with the Large Letter format In addition to Mailing Items with dimensions that fall within the Large Letter size criteria, any Letter format Mailing Items that are polywrapped must also be presented, declared and paid for as Large Letters.
Window dimensions:
• front window dimensions: the shape must be rectangular, <174mm long and <45mm high; and • back window dimensions: the shape must be circular, <48mm diameter.
Window position:
If a window is on the back face of the Mailing Item the perimeter of the window must be 31mm ± 2mm from the bottom of the envelope and centred along the long edge. 12.8 Clear Zones Clear zones are the areas on your Mailing Items that you must leave free of any text or markings. They are used by our machines to identify the Delivery Address Block, Delivery Address and Mailmark Block and Mailmark barcode and enable us to print and read tag and route codes.
13.1 Large letter dimensions
Format
Size
Weight
Thickness Max 5mm Min 1mm
Shape
Max 750gms Min 10gms
Each corner to be 90°. Portrait, landscape or square
Rectangle: Max 245mm x 345mm Min 162mm x 229mm Square: Max 245mm x 245mm Min 229mm x 229mm
Large Letter
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