The Pleasant Hearth Linear Aluminum Fireplace Glass Doors are a great way to add style, safety, and efficiency to your indoor, wood-burning, traditional masonry fireplace hearth. With a stylish inset design around the extruded aluminum frame and boasting a durable, black, powder-coated finish, the set is easy to install and can be operated by a single person with ease. With large damper slots, more airflow is fed for a larger, longer-lasting fire in your fireplace. All Pleasant Hearth Fireplace Glass Door sets are designed for masonry fireplaces only and are not for prefabricated fireplaces or metal fireboxes. See our Sizing Guide and How to Install Video on YouTube for more details. The track-free, compact, glass bifold doors have 3/16-in tempered and smoked glass and take up less space in front of the fireplace wall when open. The doors fold together in a low-profile position, so there's less chance of having to move items from your hearth to open the doors. Always keep the glass doors open and mesh panels closed when using the fireplace. The rigid mesh firescreen panels behind the doors prevent sparks, embers, and debris from leaving the hearth. When not in use, keep your fireplace doors and mesh panels closed to reduce heat and AC air loss through the chimney by up to 90% to save energy year-round. Closed fireplace glass door sets also prevent cold chimney downdrafts from entering your home and keep pets and children out of fireplace soot. Material: Steel.