MHSC BR36 Installation And Operating Manual page 16

BR/BC Series Woodburning Fireplaces
Side Wall Protection
Adjacent combustible side walls that are within mini-
mum dimensions shown in Figure 23 of the fireplace
opening must be protected with MHSC Wall Shield
Model SP40 or a specifically 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 specified 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.
Minimum Wall Clearances
WITH
Noncombustible
Surround Facing
4" Brick
(Example material)
E
F**
A - Min. clearance
C**
to combustible
perpendicular wall
Side
B - Min. clearance
Wall
to combustible
perpendicular wall when
using noncombustible wall shield*
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.
BR/BC36
BR/BC42
Fig. 23 Combustible side wall protection and hearth extension dimensions.
16
WITHOUT
Noncombustible
Surround Facing
Shaded area starts
1/2" away from
edge of unit
Firebox
E
Opening
Side
Wall
A B C
16" 12" 48°
406 mm 305 mm
20" 12" 42°
508 mm 305 mm
A hearth extension is required to protect a combustible
floor in front of the fireplace. Refer to Figure 23 for mini-
mum dimensions and mounting detail.
NOTe: Hearth extension must not cover the air
inlet opening of a fireplace.
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 floor), depth and width
must be as indicated, with the extension centered to the
fireplace 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 floor to prevent
shifting, using trim molding or other similar means at
three (3) outer edges. Seal crack between the fireplace
hearth and hearth extension with a noncombustible
material. (Figs. 23 and 25)
Minimum Hearth Extension Dimensions
(for On-Site Construction)
4"
D
May install
noncombustible
decorative
covering
OR .018" min.
sheet metal
4" MIN.
Combustible
Floor
D E F
41° 18" 14"
457 mm 356 mm 229 mm 406 mm 1372 mm
35° 18" 14"
457 mm 356 mm 305 mm 508 mm 1676 mm
FP594
SR/SC
11/20/97
Hearth Installation
G
H
J
Seal cracks
between the
fireplace
and hearth
extension with
noncombustible
material
Fireplace
Hearth
Minimum
Safety strips
Insulation must overlap
Value "R"
" minimum
G H J
9" 16" 54"
12" 20" 66"
G
FP594
7412944