Please see pictures above for measuring explanations. The dual interlocking aluminum frame gives the engineering strength to a narrow profile, and makes it possible to give a design detail to the discerning taste. A built in finger touch hidden damper gives you control over the airflow. Clear and Gray glass are available options. Trimless full fold doors open 180 degrees for enhanced viewing, ease of cleaning, and safety. Comes standard with "3/16 inch bronze tempered and edged glass" and mesh curtain. 1 5/16" wide dual interlocking aluminum frame reinforced with steel supports. Available finishes are: Polished Brass Flat Black Flat Black frame and polished brass door set trim If your opening width and / or height fall outside the chart, we can custom build one especially for you. Simply email your desired style, finish, and glass tint, together with the opening width and height of your fireplace (be sure to refer to our "Measure" page), and we will e-mail you a quote and the name of our dealer in your area if one is available. "Lower prices than Amazon and better customer service. You should start selling books." Richard Markam, OH