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3
Installing the Fireplace
Constructing the Fireplace 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, in regions where
cold air infiltration may be an issue, the inside surfaces
may be sheetrocked and taped for maximum air tightness.
To further prevent drafts, the firestops should be caulked
with high temperature caulk to seal gaps. Gas line holes
and other openings should be caulked with high temp caulk
or stuffed with unfaced insulation. If the appliance is being
installed on a cement slab, a layer of plywood may be placed
underneath to prevent conducting cold up into the room.
THE CHASE SHOULD BE CONSTRUCTED SO THAT ALL
CLEARANCES TO THE FIREPLACE ARE MAINTAINED
AS SPECIFIED WITHIN THIS INSTALLERS GUIDE.
Step 1.
Locating the Fireplace
The following diagram shows space and clearance require-
ments for locating a fireplace within a room.
Clearance Requirements
The top, back, and sides of the fireplace are defined by
stand-offs. The minimum clearance to a perpendicular wall
extending past the face of the fireplace is one inch (25mm).
The metal ends of the fireplace may NOT be recessed into
combustible construction.
For minimum clearances, see the direct vent termination
clearance diagram in this manual (see Figure 3.22).
Heat & Glo • Gateway • 288-900 Rev. S • 3/06
44" (1118mm)
44" (1118mm)
Figure 3.1
Fireplace Dimensions, Locations,
and Space Requirements
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 together.
Minimum Clearances from the Fireplace to
Combustible Materials
Glass Sides or Ends .......... 3 6 ................. 914
Floor ....................................... 0 .................... 0
Metal Sides or Ends ........... 1/2 ........... 12.5mm
Edges of Front Face* .......... 0 .................... 0
Top ....................................... 3 1/2 ............... 8 9
Ceiling** ............................... 3 6 ................. 914
* Refer to Diagram of GATEWAY (see Figure 2.1).
** The clearance to the ceiling is measured from the top
of the non-combustible board (see Figure 3.29).
Minimum Clearances from the Vent Pipe to
Combustible Materials
Vertical Sections. ......... 1 (25) ............. 1 (25)
Horizontal Sections
Top ..................................... 1 (25) ..... 1-1/2 (38)
Bottom .............................. 1 (25) ............. 1 (25)
S i d e s ................................. 1 (25) ............. 1 (25)
At Wall Firestops
Top ..................................... 1 (25) ..... 1-1/2 (38)
Bottom .............................. 1 (25) ............. 1 (25)
S i d e s ................................. 1 (25) ............. 1 (25)
Inches
mm
B-Vent
PV-Flex
Inches (mm)
Inches (mm)
11
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