3
For direct vent applications either the combustion
air duct provided with the MA Series base kit or
the direct vent kit can be used. The direct vent
kit must be ordered separately. Only for a
special CB-200A cottage base installation can
the CMF draw the combustion air from the
conditioned space. The CB-200A cottage base
kit must be ordered separately. Refer to the
replacement parts listing provided with the
furnace to order the direct vent kit or the cottage
base kit. Follow the instructions provided with
the kits for proper installation.
When unsure about combustion air supply
availability, a direct vent system should be
used. For small rooms, confined spaces, tight
construction or similar situations in which the
combustion air requirements of the furnace
might not be met, a direct vent system must be
used. The air openings in the door of the unit and
the warm air registers from the ductwork or
base must not be restricted.
Combustion air must not be drawn from a
contaminated atmosphere. Excessive
exposure to contaminated combustion air will
result in safety and performance related
problems. Some examples of chemical
contaminants are chlorine, fluorine, and sulfur,
which can be found in a wide variety of some
common commercial and household products.
The installation of the furnace must allow for an
adequate supply of combustion air. The
combustion air opening of the furnace must be
designed and located to prevent blockage by
snow.
When drawing the combustion air from
underneath the home, ensure that a vent or duct
of at least 18 square inches of free area is
provided from outside. Check to ensure that the
combustion air opening is unobstructed. When
using the combustion air duct, ensure that it
extends through the floor. When using the
direct vent kit, the combustion air opening must
be located in the same pressure zone as the flue
exit of the roof jack or chimney. Refer to the
instructions provided with the direct vent kit for
more information.
Venting Requirements — Manufactured
Housing Installations
For all manufactured housing applications, the
CMF furnace must be vented using the SRJ
series roofjack. The instructions for selecting
the proper roofjack for your installation are
detailed later in these instructions.
Venting Requirements — Residential
Installations
!
WARNING:
This furnace is not to be connected to a
chimney flue serving a separate appli-
ance designed to burn solid fuel.
For residential applications (Refer to Table 1),
the CMF furnace may be vented through the
SRJ series roofjack or through an existing
chimney. If the SRJ roofjack is to be used, then
the instructions for selecting the proper roofjack
for your installation are detailed later in these
instructions. If venting through an existing
chimney, then the venting system used must be
in accordance with these instructions, all
applicable local building codes, ANSI Z223.1/
NFPA 54 (National Fuel Gas Code), ANSI/
NFPA 31 (Installation of Oil-Burning Equipment),
and NFPA 211 (Chimneys, Fireplaces, Vents,
and Solid Fuel-Burning Appliances).
!
WARNING:
When venting through a chimney, check
the chimney for soot, leaks, obstruc-
tions, and proper installation.
The materials used to construct the venting
system must be capable of withstanding
exposure to temperatures of at least 700 degrees
F. The existing chimney servicing this furnace
must be vertical. Horizontal distances to an
existing chimney must be as short as possible,
and the connecting pipe must slope upward to
the chimney at not less than a 45 degree angle.
The total length of the sloping pipe must not
exceed 6 feet. The venting system must have
no obstructions or sharp bends where soot and
other foreign matter can accumulate.
If an inspection determines that the chimney is
obstructed, the chimney must be cleaned.
Furthermore, the connecting flue pipe must be
cleaned or replaced.
For ONLY a CMF power oil furnace installation
vented into an existing chimney, a barometric
damper can be installed at the vent connection
of the furnace to regulate the draft. The barometric
damper must be properly installed per the
manufacturer’s instructions. Refer to all
applicable codes to determine whether or not a
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