HP Color LaserJet Enterprise CP5525 Printer series - Manual (Page 103)

Paper type Image orientation Duplex mode How to load paper
Prepunched Portrait or landscape 1- or 2-sided printing Face down
Holes toward the right side of the tray
Envelopes Short edge of the envelope
feeding into the product 1-sided printing Face down
Top edge toward the back of the product
ENWW Load paper trays 87