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How to specify window size:
1.) Position the the seal flap at the top.
2.) Measure window Height from the bottom of the window to the top of the window.
3.) Measure window Width from left to right.

How to specify single and multiple window position
All windows are referenced in the same manner as envelope size, with the seal flap at the top .
Mulitple windows same side specify the top window first, bottom
second.
Mulitple windows different sides: front first, seal flap side (back) second, always indicate window on back.
1.) Position the the seal flap at the top.
2.) Measure window height from bottom to top
3.) Measure window width from the left to right
4.) Measure window position from left score (fold) to left edge of the window
5.) window position from bottom score to the bottom of the window



No.10 standard window pdf



10

No.10 Standard Window dimensions
1 1/8" High x 4 1/2" Wide.
No.10 Standard Window position is
7/8" from Left then
1/2" from Bottom