There is no shortage of material that can be used for a corner ventless gas fireplace. Some of the most common exterior materials used are stone and brick, though metal and wood are also extremely popular. The interior area of the fireplace will always be either metal or stone of some sort in order to resist the heat and prevent fire damage to the surrounding walls, but the facade outside of that can be a stylish and eye-catching material of your choice even if it is not considered fireproof or fire resistant, such as wood.
One of the biggest benefits to a corner fireplace is that it makes use of a spot in your room which is normally difficult to fill. Corners are notorious for being considered wasted space, but by placing a fireplace in this spot you can fill the area and improve the overall look of your room. Ventless gas powered corner fireplaces also provide more interior space for logs, either real or faux, which helps improve the overall design aesthetic of the fireplace itself, and since they are ventless you won't have to find room for a chimney or other ductwork.
Depending on the exterior material you choose for your fireplace, they can fit into a wide range of aesthetics. Traditional style fireplace aesthetics are normally brick or stone, but wood with a stylish mantle or scrolled decorative woodwork is also extremely common. Consider the aesthetic and decor of the room you will be installing the fireplace in to decide which material will work best for you. If your room is more of a French country style, consider going with a natural stone facade instead of a more industrial brick aesthetic.
The physical size of a corner fireplace can range anywhere from 30" to 50" wide, with an average depth of around 30" on all of those. According to indoor utility repair professional, the average gas powered ventless fireplace will provide around 25,000 BTUs of energy, which can easily heat up a room of 1,200 square feet or more. Larger fireplaces may have more BTUs and can heat larger rooms, while smaller fireplaces would be perfect for a bedroom or den that might not have a large square footage.