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Installing the Fireplace
Constructing the Chase
A chase is a vertical box-like structure built to enclose the
gas fireplace and/or its vent system. Vertical vents that run
on the outside of a building may be, but are not required to
be, installed inside a chase.
CAUTION: TREATMENT OF FIRESTOP SPACERS AND
CONSTRUCTION OF THE CHASE MAY VARY WITH THE
TYPE OF BUILDING. THESE INSTRUCTIONS ARE NOT
SUBSTITUTES FOR THE REQUIREMENTS OF LOCAL
BUILDING CODES. THEREFORE, YOUR LOCAL BUILD-
ING CODES MUST BE CHECKED TO DETERMINE THE
REQUIREMENTS FOR THESE STEPS.
Factory-built fireplace chases should be constructed in the
manner of all outside walls of the home to prevent cold air
drafting problems. The chase should not break the outside
building envelope in any manner.
This means that the walls, ceiling, base plate and cantilever
floor of the chase should be insulated. Vapor and air infiltra-
tion barriers should be installed in the chase as per regional
codes for the rest of the home. Additionally, Heat-N-Glo rec-
ommends that the inside surfaces be sheetrocked and taped
for maximum air tightness.
To further prevent drafts, the firestops should be caulked to
seal gaps. Gas line holes and other openings should be
caulked or stuffed with insulation. If the unit is being installed
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 woodburning
units if they are required.
THE CHASE SHOULD BE CONSTRUCTED SO THAT ALL
CLEARANCES TO THE FIREPLACE ARE MAINTAINEDAS
SPECIFIED WITHIN THIS INSTALLERS GUIDE.
Step 1. Locating the Fireplace
Figure 2 shows space and clearance requirements for lo-
cating a fireplace within a room.
Clearance Requirements
The top and back of the fireplace are defined by stand-offs.
The minimum clearance to a perpendicular wall extending
past the face of the fireplace is 3 inches (76.2mm). The
back of the fireplace may be recessed 17 1/2 inches
(445mm) into combustible construction.
The distance from the unit to combustible construction
is to be measured from the unit outer wrap surface to
the combustible construction, NOT from the screw
heads that secure the unit togther.
TOP VIEW
3/8
(9mm)
25
(635mm)
10
(264mm)
CORNER INSTALLATION
(TWO 45
O
ELBOWS
REQUIRED)
A
25"
B
35"
C
49"
D
39 1/2"
Figure 2.
Fireplace Dimensions, Locations,
and Space Requirements
Minimum Clearances
from the Fireplace to Combustible Materials
Glass Front ........................ 36 ..................... 914
Floor .................................... 0 ........................ 0
Rear ................................... 1/2 ..................... 13
Sides ................................. 1/2 ..................... 13
Top .................................... 1 1/2 .................... 38
Ceiling* ............................ 35 1/2 .................. 902
* The clearance to the ceiling is measured from the top of
the unit (see Figure 28).
Minimum Clearances
from the Vent Pipe to Combustible Materials
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
For minimum clearances, see the direct vent termination
clearance diagrams (Figures 20 and 21).
9
B
24 1/4 (617mm)
A
C
SIDE VIEW
Inches
mm
Inches
mm
D
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