16
BR/BC Series Woodburning Fireplaces
7412944
Side Wall Protection
Adjacent combustible side walls that are within mini-
mum dimensions shown in Figure 23 of the ireplace
opening must be protected with MHSC Wall Shield
Model SP40 or a speciically built wall shield described
in Figure 20.
The special wall shield design described in Figure 20 is
an alternate method of adding protection to side walls
and can be used in place of the SP40 with the same
wall clearances speciied for the SP40. Rt must =1.85
minimum.
examples of wall shield insulation:
1. Manville - CERAFORM 126, K=.27,
1/2 inches thick
2. MHSC - EH2416, K = .458,
1 inch thick required.
Hearth Installation
A hearth extension is required to protect a combustible
loor in front of the ireplace. Refer to Figure 23 for mini-
mum dimensions and mounting detail.
NOTe: Hearth extension must not cover the air
inlet opening of a ireplace.
The hearth extension described in Figure 23 must be a
durable noncombustible material with a minimum (total)
Rt value of 1.09; see Figure 24 for examples. The over-
all height (above a combustible loor), depth and width
must be as indicated, with the extension centered to the
ireplace opening.
The top of insulation must be covered with a noncom-
bustible decorative covering
or
a piece of .018” mini-
mum sheet metal, to protect hearth extension material.
(Fig. 23)
Secure the hearth extension to the loor to prevent
shifting, using trim molding or other similar means at
three (3) outer edges. Seal crack between the ireplace
hearth and hearth extension with a noncombustible
material. (Figs. 23 and 25)
Minimum Wall Clearances
WITH
Noncombustible
Surround Facing
WITHOUT
Noncombustible
Surround Facing
Minimum Hearth Extension Dimensions
(for On-Site Construction)
G
H
G
J
Seal cracks
between the
fireplace
and hearth
extension with
noncombustible
material
Safety strips
must overlap
56O
" minimum
May install
noncombustible
decorative
covering
OR
.018" min.
sheet metal
Fireplace
Hearth
Combustible
Floor
Minimum
Insulation
Value "R"
4" MIN.
Firebox
Opening
A -
Min. clearance
to combustible
perpendicular wall
B -
Min. clearance
to combustible
perpendicular wall when
using noncombustible wall shield*
Side
Wall
Side
Wall
F
**
C
**
E
E
D
4" Brick
(Example material)
Combustible material permitted within shaded area.
* Noncombustible wall shield requires 1" CFM Corporation
EH2416 insulation (minimum R Value = 1.85) between
decorative noncombustible rigid covering and combustible wall.
Minimum height and width is 40" x 40".
** Dimension/degree of angle will vary depending on thickness
of noncombustible surround facing.
4"
Shaded area starts
1/2" away from
edge of unit
FP594
Fig. 23
Combustible side wall protection and hearth extension dimensions.
A
B
C
D
E
F
G
H
J
BR/BC36
16"
12"
48°
41°
18"
14"
9"
16"
54"
406 mm 305 mm
457 mm 356 mm 229 mm 406 mm 1372 mm
BR/BC42
20"
12"
42°
35°
18"
14"
12"
20"
66"
508 mm 305 mm
457 mm 356 mm 305 mm 508 mm 1676 mm
