12 (1) Where the envelope of an item of standard mail has an address window, the address window shall be
(a) rectangular in shape with the greatest dimension of the window parallel to the length of the envelope;
(b) covered with transparent material that allows the address to be easily read by a person or an optical character reader;
(c) located on the side of the envelope that is not provided with a closing flap; and
(d) located not less than 40 mm from the top edge, 19 mm from the bottom edge and 15 mm from the left and right edges of the item.
(2) The complete address of the addressee shall be clearly visible through the address window of an item referred to in subsection (1).
(3) An auxiliary window on an envelope referred to in subsection (1) shall be covered with transparent material and
(a) where it is located on the front of the envelope, shall be located not less than 45 mm from the bottom edge and 15 mm from the left and right edges and shall be outside the area prescribed in section 13 for the postage meter or postage-paid-in-cash impression;
(b) where it is located on the back of the envelope, shall be located not less than 30 mm from the top and bottom edges and 15 mm from the left and right edges.
(4) No more than one auxiliary window may be located on the front or back of an envelope referred to in subsection (1).
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