10
4. Compare the maximum Btu/Hr the space can support with
the actual amount of Btu/Hr used.
_________ Btu/Hr (maximum the space can support)
_________ Btu/Hr (actual amount of Btu/Hr used)
Example:
64,000 Btu/Hr (maximum the space can support)
76,000 Btu/Hr (actual amount of Btu/Hr used)
The space in the previous example was a confined space
because the actual Btu/Hr used was more than the maximum
Btu/Hr the space could support. If you find you have a Confined
Space, you must provide additional fresh air. Your options are
as follows:
a) Re-work worksheet, adding the space of an adjoining room
that may not have qualified for the extra volume. If the extra
space provides enough volume to convert the area to an
unconfined space, remove door to adjoining room or add
ventilation grills between rooms.
b) Vent room directly to the outdoors.
c) Install a lower Btu/Hr gas log (if lower Btu/Hr size makes
room unconfined).
If the actual Btu/Hr used is less than the maximum Btu/Hr the
space can support, the space is an unconfined space. You will
need no additional fresh air ventilation.
WARNING
:
If the area in which the heater may be operated
is smaller than that defined as an unconfined space, provide
adequate combustion and ventilation air by one of the methods
described in the National Fuel Gas Code, ANSI Z223.1 Section
5.3 or applicable local codes.
Local codes may have stricter definitions for confined space
and/or for unusually tight construction. Check you local codes.
IMPORTANT
:
Do not provide openings for inlet or outlet air
into an attic if the attic has a thermostat-controlled power vent.
Heated air entering the attic will activate the power vent.
Important Pre-installation Information
Important Pre-installation Information
Overview
You will find that the Mason-Lite
Fireplace is designed for
complete assembly at your construction site with all necessary
items delivered consisting of interlocking precast parts, 50 lbs.
of Mason-Lite mortar and rebar.
The parts of the fireplace are made of Mason-Lite’s incredibly
strong blend of specialty cement and a lightweight aggregate.
The design of the fireplace calls for the installation of a refractory
fire brick liner. This should be a minimum of 1-1/8” thick. The
liner will be applied within the walls of the firebox. Modular
firebrick panels are also available from MFI.
Additional Materials Required:
1) Ready-Mix concrete - 2 cu.ft.
SURFACE CRACKS
- The MASON-LITE FIREPLACES are
manufactured using high quality materials. During the drying
process, surface cracking may occur. These small cracks
(under 1/16” will not affect the fireplace safety or performance).
During the assembly process, fill surface cracks with thin-set
mortar and brush when drying for a smooth surface finish.
Leveling and Aligning Components:
It is important to assemble all Vent-Free fireplace components
flush, level and square. Since it is not intended that mortar
be used to lay a mortar joint of any measurable thickness as
is typical when laying brick or concrete block, adjustments in
component height and level alignments are accomplished with
the use of small shims. These shims can be tapped into place
to level and align components. Once the Mason-Lite
Mortar is
set, the shims must be removed completely.
Be sure to re-grout any and all gaps where shims have been
inserted and then removed or where contact surfaces have
been separated by shim leveling.
Field Assembly Procedures
1) Mixing the MASON-LITE mortar – You will require a 50 lb.
bucket of MASON-LITE mortar which will be more than
enough to adequately affix all the fireplace components,
one to the next. The mortar is premixed and dry and
is to be used to adhere all the fireplace components.
Be sure to use clean water and work it up into a mixture that
is pasty but not lumpy. If it is too thin, the components will
not adhere. Some trial and error may be necessary. You will
want to apply the mixture with a standard grout bag.
2) Moisten all surfaces which will have grout applied prior
to assembly. This will minimize shrinkage and cracks
developing in the joint areas. Best way to accomplish this is
with a bucket of water and a large sponge. Dip sponge into
water and apply a liberal amount of water to the grout joint
surface several minutes before the part is to be assembled.
The water will absorb into the surface allowing the grout to
properly cure.
3) Assembly of the Components – Once you have found the
proper consistency of the mixture, load it into the grout
