Installing the Gas Fireplace
tion of the steel vent plate. The vent plate is to be installed in the
vertical (open) position on the outside of the vent pipe and is
designed to close off the chimney in the event the pipe is
removed or fails thus alerting the operator of a problem. The
next step is attachment of the masonry anchor plate (sup-
plied). The anchor plate is pre-drilled with holes for four ce-
ment wedge-anchors.
19) Place the plate and mark the top of the firebox. Then
remove the plate to carefully pre-drill holes for the wedge
anchors.
20) Using the supplied vent plate, apply a 1/4" (one-quarter
inch) bead of gasket cement around the base damper
lead pipe. Apply ceramic rope gasket on to the gasket
cement.
21) Apply balance of gasket cement in a 1/4" (one-quarter
inch) bead on top of smoke dome top approx. 3" (3
inches) outside of outlet hole. Install damper on top of
unit pressing damper into cement. Attach using four (4) #8
cement wedge-anchors.
Fig. 14-1
Vent plate
installation
framed opening into an attic space, the restop must be placed
into an attic floor as shown in Fig. 17-1.
Fig. 14-2 Firestop Spacer with
living space above ceiling
Existing
Ceiling
Frame
Firestop
Spacer
eight #8 x
3/4 screws
Follow your chimney manufacturer
’s instructions on specific
guidelines pertaining to their chimney and Firestop Radiation
Shield installation instructions.
Fig. 14-3 Firestop spacer with
attic space above ceiling
eight #8 x 3/4
Attention:
Clearance to combustible construction can not
be reduced during course of construction. For
safe operation of the finished fireplace, these
clearances must be followed when building the
Firestop
Spacer
Mason-Lite™ Firebrick Liners
screws
Existing
Ceiling
Frame
framework to house the chimney system.
22) Now that you have completed the smoke dome assembly,
all the components should stack up for a smooth transition
into the flue components. Setting the smoke dome
completes the MASON-LITE Firebox and Smoke Dome
assembly. You are now ready to begin the installation of
the necessary firebrick lining and the flue components.
WARNING: DO NOT PACK REQUIRED AIR SPACES WITH
INSULATION OR OTHER MATERIALS.
Firestop Radiation Shield
A Firestop Radiation Shield is required in multistory
installations at each floor penetration above that where the
Support Box is located.
Firestop Radiation Shields also provide complete separation
from one floor space to another or attic space as required
by most codes. When the double wall pipe passes through a
IMPORTANT:
Regardless of whether you install a custom or
modular liner, the provided grate-leg lock brackets must be
installed after the floor of the liner is installed, and prior to the
side walls being installed. The brackets are to be installed on
the side of the fireplace that is opposite the gas supply.
Insert each bracket underneath the side bricks as shown (next
page) and cement in place.
Custom Firebrick Lining
Custom Firebrick lining is not supplied by Masonry Fireplace
Industries (MFI). There is, however, the option of modular
pre-fabricated panels that can be obtained from MFI. See
exploded parts page for details.
If custom firebrick lining is desired, 1-1/8
” inch thick liners will be
required. The pattern for the firebrick lining is exclusively your
choice. Before you install the lining, remember to consider any
holes your contractor may need to drill for gas, electrical or
combustion air kit access holes.
Please use a certified mason to lay-in the brick. He will follow
REV 1 - 0907231405
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L-A2-27509
