Clearances And Height Requirements - Vermont Castings NBST27 Installation Instructions Manual

CLEARANCE and HEIGHT REQUIREMENTS
The dimensions shown in Figures 3 through 9 and defined in the fireplace
manufacturer's instructions are minimum clearances to maintain when
installing this heater. Left and right clearances are determined when
facing the front of the heater.
When heater is installed into a ventless firebox, minimum clearances,
as specified by the ventless firebox manufacturer, must be met.
Follow these instructions carefully to ensure safe installation. Failure
to follow instructions exactly can create a fire hazard.
Sidewall and ceiling clearances: The sides of the fire-
place opening must be at least 1C\v" from any combustible
wall. The ceiling must be at least 42" from the top of the
fireplace opening. The wall parallel to the side of the heater
must be at least 36" from the side of the heater. Refer to
your firebox owners manual for more information.
42"
1 "
Figure 3 -
Sidewall and Ceiling Clearances
IMPORTANT:
1. If installing unit into an unvented firebox, minimum
required clearances listed in the firebox installation
manual must be met.
2. If installing unit into a vented firebox with a working
damper, minimum clearances shown in Figure 8 through
10 must be met
3. If installing unit into a vented firebox with a damper that
is always open, no minimum clearances are required.
Heat resistant material (minimum requirements) with
no wooden mantel or other combustible projection:
81D3032
36"
36"
FP2363
clearances
To install the gas logs into a fireplace with no wooden
mantel, shelf or other combustible projection above the
fireplace opening, measure the heat resistant material
height, per Figure 4, then see TABLE A.
Heat resistant materials such as slate and marble must be
at least 1/2" thick. Sheet metal should not be installed
onto combustible material.
IMPORTANT: If the unit is installed in a vented fireplace
and cannot meet these minimum clearances you must
operate the heater with chimney flue damper open. Refer
to "Installing Vented Applications" on Page 11.
Figure 4 -
Measure Heat Re-
sistant Material
FP2363
Table A - Heat Resistant Material Requirements with
no Mantel or Combustible Projection
Heat Resistant
Material
Measurement
12" or more
8" to less than 12"
Less than 8"
NBST27 Unvented Gas Log Set
Heat Resistant
Material
Heater in
Fireplace or
Firebox
FP2364
FP2364
Requirements for
Heat resist matl
Safe Installation
Hood not required
Extend heat resistant material to
12" or install hood. Figure 4
Extend heat resistant material to
at least 8" and install hood. Figure 4
OR extend heat resistant material to
a height of at least 12"
Measure This
Distance
7