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103451
UNVENTED (VENT-FREE) LOGMATE™ FIREBOX
VANGUARD
1. Frame in rough opening. The firebox
framing should be constructed of 2 x 4
lumber or heavier. Use dimensions in
Table 1 and rough opening layout in
Figure 8a. Adjust framing so that fire-
box flushes with finished wall surface.
If installing in a corner, use dimensions
in Figures 8b and 8c for rough opening.
2. Install gas piping to firebox location.
See Installing Gas Line on page 10 and
Connecting to Gas Supply in log set
owners manual.
IMPORTANT:
If installing blower acces-
sory (Models FB36CA and FB42C), see
Hard-Wiring Firebox, page 10.
Figure 8 - Rough Opening for Installing in Wall
BUILT-IN FIREBOX
INSTALLATION
Built-in installation of this firebox involves
installing firebox into a framed-in enclo-
sure. This makes the front of firebox flush
with wall. Optional brass trim accessories
are available (see Accessories, page 13).
The brass trim will extend past sides of
firebox approximately 1/2 inch.This will
cover the rough edges of the wall opening.
If installing a mantel above the firebox, you
must follow the clearances shown in Figure
7. Follow the instructions below to install
the firebox in this manner.
FRONT WIDTH DEPTH
MODEL # (Inside to Inside) HEIGHT (Minimum)
FB36NCA 41
1
/4" 37" 20"
FB36CA 41
1
/4" 35
1
/2" 20"
FB42NC 47
1
/4" 37" 20"
FB42C 47
1
/4" 35
1
/2" 20"
ROUGH OPENING DIMENSIONS FOR BUILT-IN INSTALLATION
Depth
(Minimum)
Width
(Inside to Inside)
Height
TABLE 1
Figure 8a
36"
41-1/4"
50-29/32"
72"
45°
TOP VIEW
FOR 36" MODELS
Height - 37" for FB36NCA
35 1/2" for FB36CA
55-5/32"
78"
39"
47-1/4"
45°
TOP VIEW
FOR 42" MODELS
Height - 37" for FB42NCA
35 1/2" for FB42CA
Figure 8b
Figure 8c
INSTALLATION
Continued
Mantel Clearances for Built-In
Installation
If placing custom mantel above built-in
firebox, you must meet the minimum allow-
able clearance between mantel shelf and top
of firebox opening shown in Figure 7. These
are the minimum allowable mantel clear-
ances for a safe installation. Use larger clear-
ances wherever possible to minimize the
heating of objects and materials placed on
the mantel.
Figure 7 - Minimum Mantel Clearances for Built-In Installation
Firebox Hood
Must Be Used
at All Times
Wire-mesh
Screen
Firebox
Non-combustible Material
May Project Off this Surface
above the Firebox Hood
Mantel Shelf
13" 16" 19" 21"
2
1
/2
"
6"
8"
10"
Note:
All vertical measurements
are from top of fireplace
hood opening to bottom
of mantel shelf. All
measurements are in
inches.
Facing material (above
firebox) may be of
combustible material,
including decorative
mantel ornaments.
CAUTION: Do not allow the
vent-free gas log heater to touch
or extend beyond the fireplace
screen.
If your installation dies not meet the above
minimum clearances in Figure 7, you must:
• raise the mantel to an acceptable height,
OR
• remove the mantel.