This firebox is made of high quality materials, and has an effective design that enables efficient air circulation. This firebox has a 32 inch opening, and is inexpensive and provides a great value. The design looks great and is very functional. This firebox is installed to the front of your fireplace, and gives it a mason like finish. For the perfect combination of aesthetic and functional appeal, the Universal VF Vent Free Firebox is a great product at a reasonable price.