What are the address visibility requirements for window envelopes?
Mailers using window envelopes (both letter-size and flat-size) should design inserts and address element placement to ensure successful processing of window envelopes on automated equipment. One critical element that must be considered in the design stage is adequate clear space (blank space) between the address block and all four edges of the window. The mailpiece should be designed so that when it is inserted into the window envelope the address block will appear in the window no matter how it is shifted or moved within the envelope. The requirements for clear space around the address block are as follows: o For non-automation mail – (except letter-size mail bearing a barcode in the address block and submitted at Enhanced Carrier Route high density and saturation prices):§ A clear space of at least 1/8 inch is required between the address block elements and the top, bottom, left and right edges of the window. o For automation mail and letter size mail submitted at Enhanced Carrier R
