Parts of the mantel assembly located along the sides of the fireplace opening which project more than 1 1 2 inches 38mm from the face of the fireplace shall have additional clearance equal to the projection extension beyond 1 1 2 inches.
Building code gas fireplace surround.
A mantel must be at least 6 inches from the fireplace opening.
These are usually based on the international building code standards along with standards set by the national fire code.
National standard building code information.
2114 3 10 all combustible mantels and similar trim shall be kept at least 6 inches from fireplace opening.
Local building codes take precedence over national and international codes but it s best if your fireplace meets or exceeds these standards.
You ll want to familiarize yourself with your local building code for fireplaces.
Mantel corbels and brackets attached along the sides of the opening must have additional clearance if they project more than 1 1 2 inches out from the face of the fireplace.
Combustible materials and trim must be at least 6 inches from the firebox opening.
The hearth design must be.
Circulating air ducts used with steel fireplace units shall be constructed of metal or masonry.
National standard building code.
For a fireplace with a larger opening of more than 6 square feet the icc requires a hearth that extends 20 inches or more in front and 12 inches or more along the sides.