The extra clearance sounds trivial and is not: a folded A4 letter into a true DL is tight, and on a folder-inserter that tightness becomes a jam rate. DLX takes the same letter with room. Confirm which your equipment and your window template assume before ordering a full carton of either. See correspondence envelopes, pocket envelopes and packaging envelopes.

DLX Envelopes for Mail

Shop DLX envelopes for business mail, documents, brochures, invitations, notices and professional correspondence.