HP Deskjet 5145 Color Inkjet Printer - Manual (Page 109)

envelopes
guidelines
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Avoid using envelopes that: have clasps or windows; have thick, irregular, or
curled edges; are shiny or embossed; are wrinkled, torn, or otherwise
damaged.
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Align the envelope edges before inserting them in the In tray.
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In tray capacity: Up to 20 envelopes
preparing to print
1. Remove the Out tray, then remove all paper from the In tray.
2. Slide the paper width guide all the way to the left, then pull out the paper
length guide.
3. Place the envelopes, with the printable side down and the flap to the left, in
the right side of the In tray. Push the envelopes into the printer until they stop.
4. Slide the paper guides firmly against the envelopes.
5. Replace the Out tray.