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The #14 is the largest standard commercial letter envelope in the U.S. numbering system, and this version adds the single-window feature that eliminates envelope addressing entirely. At 5 x 11 1/2 inches with a window at the standard commercial left-side position, it holds a legal-size 8.5 x 14 sheet folded into thirds, a thick multi-page correspondence packet, or any outgoing piece that has outgrown the capacity of a #10 or #12 while still requiring the recipient's address to show cleanly from the document inside. One buyer uses these specifically for mailing brochures. That's a practical use case: a brochure with the recipient's mailing address printed in the window position, folded, inserted, sealed. No label, no handwriting, no separate addressing step. Available blank or with custom logo and return address printing from Business Envelopes. Free shipping, no minimums.
The window on a #14 business envelope works identically to the window on a #10. A clear poly-film panel at the standard commercial left-side position shows the recipient's address from the document inside. Any document already formatted to display the recipient's address at the standard window position for a #10 will align correctly in the #14 when the same tri-fold is used. The window position is the same relative to the left edge and bottom of the envelope across commercial sizes.
The practical case for the #14 window over the #10 window is capacity. A standard #10 window envelope handles a letter sheet folded into thirds with a quarter inch of clearance on each side. For a thick billing packet, a multi-page statement with attachments, a legal-size document with a cover sheet, or any piece where the #10 strains under the content load, the #14 gives nearly an inch of additional height and nearly two inches of additional width. The window eliminates the addressing step at any content volume. For organizations sending 100 or 500 pieces with this format, the time saved on addressing across the batch is the same proportional value regardless of envelope size.
Buyers searching "envelopes with windows" or "business window envelopes" typically default toward the #10 as the standard business window envelope. The #10 at 4 1/8 x 9 1/2 inches is the most widely stocked window envelope in commercial supply programs and the right choice for standard letter-rate correspondence with a moderate content load. The #14 at 5 x 11 1/2 inches is the right choice when the content load regularly exceeds what a #10 handles comfortably, when legal-size documents are included, or when the mailing program includes brochures, thick multi-page packets, or report mailings where fold-free document presentation matters and the #10 is the wrong size for the contents.
Both qualify for First-Class letter-rate postage. Both use the same window position for standard document alignment. The only operational difference is the interior capacity and the dimensional profile.
For the standard #10 window envelope for lighter single-sheet correspondence, see the #10 White Window Gum Flap. For the #14 in a plain windowless format, see the #14 White Gum Flap. For the #12 window that sits between the #10 and #14 in capacity, see the #12 White Window Gum Flap. Browse the full window envelope range for all sizes and configurations. Ships same or next business day on blank stock.
Perfect size for mailing brochures.
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