The overall size of an extruded aluminum frame can be custom built to your specific opening. However, the actual frame size (width of the metal) remains the same.
Steel fireplace doors and frames can be sized to any opening, as well as the frame size. In addition, the steel allows for custom designs and/or monograms to be incorporated into the door.
Fireplace doors can be installed on two distinct types of wood burning fireplaces, masonry (an on-site fireplace constructed from brick, block and mortar material) and manufactured (a metal firebox and flue system installed inside a wood-framed chimney). Fireplace doors must be approved specifically for use on manufactured fireplaces. These doors cannot extend more than one inch from the face of a manufactured firebox. Therefore, they cannot overlap a traditional brick or stone facing material.
A reface fireplace door covers the cooling vent louvers on a manufactured fireplace – both wood burning and direct vent. They are typically built using a steel frame. These doors are custom built to overlap the metal face of the fireplace and fit tightly inside the facing material i.e. tile, marble, brick or stone. They are usually secured to the metal firebox using earth magnets.
When burning a gas product in a wood burning fireplace, glass fireplace doors must remain open. A mesh screen can be used in lieu of traditional glass in any steel framed door. This does require a cabinet style door, but it allows the doors to remain closed during operation.