HP LaserJet 4250/4350 Series - User Guide
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.... See Printer memory. ENWW Printing on both sides of paper when an automatic duplexer is included with the optional duplex-printing accessory To duplex manually Guidelines for printing on both sides of labels, transparencies, envelopes, vellum, custom sizes, or paper heavier than 28 lb (105 g/m2) ... on both sides of paper Do not print on both sides of paper To duplex with the HP LaserJet 4250dtn, 4250dtnsl, 4350dtn, and 4350dtnsl printers. The automatic duplexer is installed. See To duplex manually. The duplex slot cover that is located at the rear of the printer must be required....
.... See Printer memory. ENWW Printing on both sides of paper when an automatic duplexer is included with the optional duplex-printing accessory To duplex manually Guidelines for printing on both sides of labels, transparencies, envelopes, vellum, custom sizes, or paper heavier than 28 lb (105 g/m2) ... on both sides of paper Do not print on both sides of paper To duplex with the HP LaserJet 4250dtn, 4250dtnsl, 4350dtn, and 4350dtnsl printers. The automatic duplexer is installed. See To duplex manually. The duplex slot cover that is located at the rear of the printer must be required....