The inside frame that would fit into your opening is 30" wide to the outside and 11 5/8" tall to the outside. The holes are reinforced with small backer plates. I pack my items very well so they will arrive safely. The item "Antique Floor Grate 31 x 13 Wrought Iron Cast Victorian Cold Air Return Register" is in sale since Tuesday, July 19, 2016. This item is in the category "Antiques\Architectural & Garden\Hardware\Heating Grates & Vents".
The seller is "joshwindsweptacres" and is located in Oakfield, Wisconsin. This item can be shipped to United States.