Duct opening size - 14 3/4 x 3 1/4 (Overall dimensions 15 3/4 x 4 1/4) Oil Rubbed Bronze Herringbone return vent cover with two screw holes, one on each short end and flat on the back for $86.00 each.
Duct opening size - 30 x 12 Oil Rubbed Bronze Herringbone return vent cover NO screw holes, 1/4" thickness, and extra strapping for $690.00 each.