14
flexible metal conduit as the source for outside combustible
air. It can go straight out through an outside wall or into a
ventilated crawl space. If crawl space is used, check codes
for proper termination.
3. Be sure that you carefully check the source of the outside
air before you choose the site for your air intake. You don’t
want a place where snow will collect, where bushes or trees
will be growing or a location that is too close to any other
structure.
4. The suggested maximum height for the air intake tubing
is 50 ft. (fifty feet) above the hearth. That height is if the
intake finishes off at a minimum of 3 ft. (three feet) below
the chimney cap level.
5. Install a screened termination cap to keep out animals.
Mason-Lite Chimney Systems
Overview
This Mason-Lite gas appliance may be installed with an
approved 10” B-vent chimney system. A metal chimney adapter
is required to attach the chimney to the top of the firebox. This
can be purchased from FMI: part number MFP-DD.
Installers are cautioned to put the chimney system together
exactly as instructed and shown in chimney manufacturer’s
guide. Any variations may have serious consequences resulting
in an accident or malfunction. If instructions are not followed,
the warranty on the product will become null and void.
Note that the most important aspect of the installation is the
maintenance of minimum required clearances to combustible
materials. Those specific installation requirements must
be followed with great precision as you are dealing with the
potential of fire hazard if the correct combustible limit is not met
and maintained. When you look at the drawings provided in this
section, you will see that actual installations may vary due to
individual design preferences. That is to be expected.
Design and framing specifics may vary from the drawing
to installationy. Clearances to combustibles is a stringent
requirement.
WARNING:
If you do not use chimney manufacturer’s parts and/or if you
do not follow exact instructions for installation of chimney
components, you may be responsible for appliance malfunction,
an accident or a fire hazard.
Attention:
Be advised that your choice of Chimney System
meets the following standards and requirements:
●
Designed for installation in accordance with National Fire
Protection Standard
● Meets requirements of NFPA 211
●
Designed in accordance with BOCA Basic National Codes
●
Meets Uniform Building Codes.
General Chimney Requirements for Height and Clearance
When installed, the
maximum
overall height of the chimney
system from bottom of appliance to the top/termination chimney
is 40 feet. The
minimum
installed height of the completed
Chimney System is 14 feet with a straight flue stack, 17 feet if
the chimney includes one or two offset sections.
Throughout the length of the chimney – along the outer
periphery of the flue you must have at least 1” (one inch) of
clearance all around the circumference. When the chimney is
passing through a living space, it must be completely closed off.
A “live” chimney is never allowed to be within reach of humans;
the chimney must be completely designed to be hidden from
view and protected, away from human interaction.
Note that it is acceptable for the chimney’s firestop space and
roof flashing to come in direct contact with common construction
materials, such as drywall, flooring, paneling, plywood, millboard,
particle board and a variety of normal framing materials. Always
follow the specific installation requirements of your selected
chimney manufacturer.
Determining Finished Height for Appliance
Overview
Figuring out the exact height of the Mason-Lite Appliance you
are about to install is relatively easy if you follow a few simple
steps. It is a matter of determining the number of chimney
sections and the chimney components that will be required for
the installation. Bear in mind that the minimum height of the
MASON-LITE once installed is 14’0” (fourteen feet) and that it
is higher if offsets are used. Here is how to calculate the height
of the completed appliance:
1. First, ascertain the height of the chimney. This includes the
distance from the very top of the smoke dome to where the
top of the flue ends. That is where the smoke leaves the
flue.
2. Aside from the chimney sections, include all the components
that you will be using in your installation - anchor plate
damper, firestop spacers, stabilizers, and offsets.
3. Create a Component Height Chart by measuring each
component and completing the following:
Anchor Plate
=
4 ”
Firestop Spacers
=
_ _ _ _ _ _
Support box
=
_ _ _ _ _ _
Stabilizers
=
_ _ _ _ _ _
Offsets
=
_ _ _ _ _ _
Pipe Sections
=
_ _ _ _ _ _
(Stabilizer – Must be present on vertical chimneys every
30 feet and on offset chimneys every 10 feet.)
4. Take the total height of every component that will be
included in your installation and then subtract that from the
desired total height you wish the finished appliance system
to be.
5. You will need to refer to the chimney manufacturer’s
information in order to figure out the available lengths and
the quantity of the sections that you will need.
