16
CLEARANCES
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MANTELS
The graph below shows a range of allowable depths and heights for a combustible mantel installation.
As shown, the minimum allowable mantel height above the replace opening is 2”/50 mm with a 1”/25 mm deep mantel.
The maximum mantel depth is 12”/300 mm at a minimum height above the replace opening of 13”/330 mm.
All of the mantel height/depth combinations fall in between these extremes in accordance with the chart below.
Mantels made of non-combustible material are allowed inside these dimensions but they will be subjected to elevated
temperatures and may become too hot to touch.
A typical completed installation with mantel is shown in the diagram below, on the right.
A
A
B
B
VENT OPENING
800cm² (124In²)
TOTAL MINIMUM
(2") 50
C
SECTION
A-A
(36")
900
(36")
900
(36")
900
SECTION
B-B
COMBUSTIBLE MATERIALS
NOT PERMITTED IN FRONT
OF GLASS
(2")
50
(11")
280
DETAIL C
SCALE 1 : 10
CONSTRUCTION
BEAMS NON-
COMBUSTIBLE
(TYPICAL)
TOP OF FIREPLACE
OPENING
GLASS
NON COMBUSTIBLE
MATERIAL
DETAIL C
CONVECTION GAP
CONSTRUCTION
BEAMS COMBUSTIBLE
(TYPICAL)
1”/25 mm
12”/300 mm
2”/50 mm
Mantel Depth
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