Gas Log Set Installation

7
NBST27 Unvented Gas Log Set
Monessen • NBST27 Gas Log Set Installation/Owner's Manual • 81D3032 • Rev A • 08/16
CLEARANCE AND HEIGHT REQUIREMENTS
Sidewall and ceiling clearances: The sides ofthere-
place opening must be at least 1
3
⁄4" from any combustible
wall. The ceiling must be at least 42" from the top of the
replaceopening.Thewallparalleltothesideoftheheater
must be at least 36" from the side of the heater. Refer to
yourreboxownersmanualformoreinformation.
42”
36”
36”
1³⁄₄”
FP2363
clearances
Figure 3 -
Sidewall and Ceiling Clearances
IMPORTANT:
1. If installing unit into an unvented rebox, minimum
required clearances listed in the rebox installation
manual must be met.
2. If installing unit into a vented rebox with a working
damper, minimum clearances shown in Figure 8 through
10 must be met
3. Ifinstallingunitintoaventedrebox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:
To install the gas logs into a replace with no wooden
mantel, shelf or other combustible projection above the
replace 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replace
and cannot meet these minimum clearances you must
operatetheheaterwithchimneyuedamperopen.Refer
to “Installing Vented Applications” on Page 11.
FP2364
Heat resist matl
Measure this Distance
Heat Resistant
Material
Heater in Fireplace or
Firebox
Figure 4 -
Measure Heat Resistant Material
Table A — Heat Resistant Material Requirements
with no Mantel or Combustible Projection
The dimensions shown in Figures 3 through 9 and
dened in the replace 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 rebox,
minimum clearances, as specied by the ventless
rebox manufacturer, must be met.
Follow these instructions carefully to ensure safe
installation. Failure to follow instructions exactly
can create a re hazard.
WARNING
Heat Resistant
Material Mea-
surement Requirements for Safe Installation
12" or more Hood not required
8" to less than 12" Extend heat resistant material to 12" or
install hood. Figure 4
Less than 8" 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"