15
BFC36 Balanced Flue Heat-Circulating Fireplace
7412647
Side Wall Protection
Adjacent combustible side walls that are within minimum
dimensions shown in Figure 23 of the fireplace opening
must be protected with a specifically built wall shield as
described in Figure 17.
The special wall shield design described in Figure 18 is
an alternate method of adding protection to side walls. Rt
must =1.09 minimum.
Examples of wall shield insulation:
1. Manville - CERAFORM 126, K=.27,
1/2 inches thick
2. EH2416, K = .458,
1 inch thick required.
Hearth Installation
A hearth extension is required to protect a combustible floor
in front of the fireplace. Refer to Figure 20 for minimum
dimensions and mounting detail.
Note: Hearth Extension must not cover the air inlet
opening of a fireplace.
The hearth extension described in Figure 20 must be a
durable non-combustible material with a minimum (total)
Rt value of 1.09; refer to Figure 21 for examples. The
overall 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 non-combus-
tible decorative covering
or
a piece of .018” minimum sheet
metal, to protect hearth extension material. (Fig. 20)
Secure the hearth extension to the floor to prevent shift-
ing, using trim molding or other similar means at three (3)
outer edges. Seal crack between the fireplace hearth and
hearth extension with a non-combustible material. (Figs.
20 and 22)
WARNING: Hearth extension must be installed in ac-
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
1/2” Min.
EH2416 or
equal “R”
value
4" MIN.
FP594b
BFC combustible min.
8/21/00 djt
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" 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.
Shaded area
starts 1/2" from
away from edge
of unit 4"
FP594b
Fig. 20
Combustible side wall protection and hearth extension dimensions.
A
B
C
D
E
F
G
H
J
BFC36
26”
12”
17°
25°
12”
8”
8”
18”
47
Z\v
”
660 mm 305 mm
305 mm 203 mm 203 mm 457 mm 1200 mm
