Vermont Castings BR36 Homeowner's Installation And Operating Manual page 16

BR/BC Series Woodburning Fireplaces
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 20.
The special wall shield design described in Figure 20 is
an alternate method of adding protection to side walls. Rt
must =1.85 minimum.
examples of wall shield insulation:
1. Manville - CERAFORM 126, K=.27,
1/2 inches thick
2. Vermont Castings Group - EH2416, K = .458,
1 inch thick required.
(Micor 300)
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 minimum
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 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 noncombus-
tible decorative covering or a piece of .018" minimum sheet
metal, to protect hearth extension material. (Fig. 23)
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 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
1/2" Min.
Safety strips
EH2416 or
must overlap
Equal "R"
1/2" minimum
Value
G H J
9" 16" 54"
12" 20" 66"
G
FP594
7412944