85-03-01205
ML-SERIES FIREPLACE
Page
25
3.2.12
Clearances to Combustible Side Walls
The minimum distance required from the edge of the unit to a combustible side wall is 18
”.
Combustible side walls, mantel
corbels, mantel legs and other combustible walls and decorative objects must fall behind a 45-degree line extending
outward from the edge of the unit unless such objects are more than 18
” away
from the edge of the unit.
MODEL
A
B
C
D
MIN.
ENCLOSURE
FRAMING
WIDTH
ENCLOSURE
SIDE
TO VENT
CENTER
MINIMUM
FRAMING
DEPTH
FINISHED
FRAMING
WIDTH
ML39
56
28
19 1/2
47
ML47
62
31
19 1/2
54
ML54
69
34 1/2
19 1/2
61
ML60
75
37 1/2
19 1/2
67
ML72
86
43
19 1/2
78
If the r e quir e d c le ar anc e c annot be me t to a pr e -e x isting c ombustible side wall, an NFPA appr ove d c le ar ance
r e duc tion shie ld , me tal or c e r amic boar d, must be adde d to the side wall.
3.2.12.1
Horizontal Clearance Reduction by 66%
NFPA 211 Approved
: Install 20-gauge or heavier steel s
hield that provides at least a 1”
active airspace, on the combustible wall
surface. To provide for active airflow, install at least 1” metal or ceramic standoffs or spacers b
etween the metal shield and the
combustible surface being protected. The bottom and top edges of the cavity between the metal shield and the combustible
surface must be left open. The steel
shield must be a minimum of 12”
larger in each direction than the surface area of the
source of heat; or if the surface being protected is smaller than surface area of the source of heat, this shield must be lar ger
than the combustible surface in each direction.
By using this method of protection, if the required horizontal clearance was 16
”
, the resulting clearance will be reduced by 66%
to 5-3/8
” between the heat source and the metal shield.
3.2.12.2
Horizontal Clearance Reduction by 50%
NFPA 211 Approved
: Install an R-1 rated ceramic board or R-1 rated mineral board on the wall you are attempting to protect.
by using this method of protection, if the required horizontal clearance was 16
”
, the resulting clearance will be reduced by 50%
to 8
” between the heat source and the
R-1 Rated wall board.
