9
Installing the Fireplace
Step 1. Locating the Fireplace
Thefollowing diagramshows space andclearance require-
ments for locating a fireplace within a room.
ABCD E
42” 22” 36” 51” 72”
Minimum Clearances
from the Fireplace to Combustible Materials
Inches mm
Glass Front ........................36..................... 914
Floor ....................................0........................ 0
Rear ................................... 1/2 ..................... 13
Sides ................................. 1/2 ..................... 13
SurroundSides* ..................0........................ 0
Top....................................3 1/2.................... 89
Ceiling**..............................31..................... 787
Figure 2. Fireplace Dimensions, Locations,
and Space Requirements
Minimum Clearances
from the Vent Pipe to Combustible Materials
Inches mm
Vertical Sections...............1................. 25
Horizontal Sections
Top......................................3................. 75
Bottom................................1................. 25
Sides ..................................1................. 25
At Wall Firestops
Top................................... 2 1/2.............63.7
Bottom.............................. 1/2 ............... 13
Sides ..................................1................. 25
* See Figure 3.
**The clearanceto theceilingismeasuredfromthetop
of the unit, excluding the standoffs (see Figure 38).
Thedistance fromthe unit tocombustible construction
is to be measured from the unit outer wrap surface to
thecombustibleconstruction,NOT fromthescrewheads
that secure the unit together.
For minimum clearances, see the direct vent termination
clearancediagrams (seeFigures 30and 31).
1/2” MIN. (13mm)
D
C
E
B
1” MIN. (25mm)
A
Clearance Requirements
The top, back, and sides of the fireplace are defined by
stand-offs.The minimumclearance to a perpendicular wall
extendingpast the faceof thefireplace is oneinch (25mm).
The back of the fireplace may be recessed 21 1/2 inches
(546 mm) into combustible construction.
Constructing the Fireplace Chase
A chase is a vertical box-like structure built to enclose the
gasfireplace and/orits vent system. Vertical ventsthat run
on the outside of a building may be, but are not required to
be, installed inside a chase.
CAUTION: TREATMENT OF FIRESTOPSPACERS AND
CONSTRUCTIONOFTHECHASEMAYVARYWITHTHE
TYPE OF BUILDING. THESE INSTRUCTIONSARE NOT
SUBSTITUTES FOR THE REQUIREMENTS OF LOCAL
BUILDINGCODES.THEREFORE,YOURLOCAL BUILD-
ING CODES MUST BE CHECKED TO DETERMINE THE
REQUIREMENTS FOR THESE STEPS.
Factory-builtfireplace chasesshould beconstructed in the
manner of all outside walls of the home to prevent cold air
draftingproblems. The chase should notbreak the outside
buildingenvelope inany manner.
This means that the walls, ceiling, base plate and cantile-
ver floor of the chase should be insulated. Vapor and air
infiltration barriers should be installed in the chase as per
regional codes for the rest of the home. Additionally, we
recommend that the inside surfaces be sheetrocked and
taped for maximum air tightness.
Tofurther preventdrafts, the firestopsshould becaulked to
seal gaps. Gas line holes and other openings should be
caulked or stuffed with insulation. If the unit is being in-
stalled on a cement slab, we recommend that a layer of
plywood be placed underneath to prevent conducting cold
up into the room. Be sure to include spark arrestors for
woodburningunits ifthey arerequired.
THECHASE SHOULD BECONSTRUCTEDSOTHATALL
CLEARANCES TO THE FIREPLACE ARE MAINTAINED
AS SPECIFIED WITHIN THIS INSTALLERS GUIDE.
