Kodak 9.1 - Manual (Page 54)

Handling Paper
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5. Insert the envelopes with the flap up and against the right side of the tray.
6. Move the envelopes forward until they stop.
7. Move both the left and front paper-edge guides until they touch the envelopes.
8. Push in the main paper tray until it clicks into place, and lower the output tray.