Sealing Tolerances
Opening flaps must be sealed as far along the edge as possible. All remaining edges must be sealed.
6.1 Letters presented in trays For DL and C5 letters with rectangular or trapezium shaped opening flaps presented in trays only, there is a maximum tolerance of up to 35mm from the left and right edges and 35mm from the top edge where the flaps do not have to be sealed.
6.2 Letters presented in bags
For all other Letter sizes there is a maximum tolerance of up to 25mm from the left and right edges and 35mm from the top edge where the flaps do not have to be sealed.
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