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Fireplace Mantel Clearances

Minimum Mantel Vertical Clearances

There are minimums for clearances for combustible mantel height above a fireplace. NFPA codes for minimum clearances are as follows:

Minimum Mantel Horizontal Clearances

Additionally, there are minimums for clearances for combustible mantel width beside a fireplace. NFPA codes for minimum clearances are as follows:

  • Ref.
  • Mantel Leg from Side of Opening
  •  
  • K
  • 11.5
  •  
  • L
  • 9.5
  •  
  • M
  • 7.5
  •  
  • N
  • 5.5
  •  
  • O
  • 3.5
  •  

 

  • Ref.
  • Mantel Leg Depth
  •  
  • F
  • 10"
  •  
  • G
  • 8"
  •  
  • H
  • 6"
  •  
  • I
  • 4"
  •  
  • J
  • 2"
  •  

 
Minimum Mantel Horizontal Clearances - Flat Trim

If the combustible required (i.e., trim) projects from the facing less than 1.5 inches (A, below), the closest to the fireplace opening it can start if 6 inches (B, below).

If the combustible required (i.e., trim) projects from the facing more than 1.5 inches (A, below), the closest to the fireplace opening it can start is 12 inches (C, below).