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CABO
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MHCSS
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Fireplaces,
Fireplace Stoves, and Fireplace Chimneys
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| CABO
does not address.
Does not restrict
fireplace or stove locations.
Requires
combustion air passageways to be a specified dimension, and the
intake protected with 1/4" screen.
Combustion air inlet
may be within 24" of the firebox on or near the floor.
CABO does not specify
spark arresters, and has no height requirements for factory-built
chimneys. (Has height requirements for masonry chimneys).
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Fireplaces
and stoves must be equipped with integral door and labeled,
"For use with solid fuel only."
Prohibits fireplaces and
stoves in sleeping rooms.
MHCSS does not address.
Combustion
air inlet must be connected directly into the firebox.
Factory-built chimneys must
be equipped with spark arresters, and extend 3' above the roof, and
2' above the highest elevation of the home within 10' of the
chimney.
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| CABO |
MHCSS |
| Clearances |
| CABO
does not address.
CABO does not address.
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Provides
requirements and dimension specifications to prevent, or warn
against, storage of combustible materials around heat-producing
appliances.
Prohibits doors or drapes to
be placed where they could swing inside listed clearances.
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| CABO |
MHCSS |
| Controls |
| Requires
gas and oil appliances to have a shut-off valve in the event of
pilot or ignition failure.
Requires a
temperature limit control to prevent outlet air from exceeding 250 F
in forced air furnaces.
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Requires
shut-off feature through referenced standards (ANSI Z-21.47 and UL
307-b). Requires furnaces to be third-party listed to
referenced standards.
Requires temperature limit control
through referenced standards (ANSI Z-21.47 and UL 307-b).
Requires surface temperature of the furnace not to exceed 90 F above
room.
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| CABO |
MHCSS |
| Duct
Systems |
| Requires
class 0 or class 1 ducts for those portions closer than 3' from the
outer casing of the appliance. Limits duct linings or
coverings to a flame spread of 25, and a smoke density rating of 50.
Limits duct linings or coverings to a flame spread of 25, and a
smoke density rating of 50.
CABO does not address.
CABO does not
address.
CABO does not
address.
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Requires
class 0 or class 1 ducts for those portions closer than 3' from the
outer casing of the appliance, 2' in the case of return
ducts.
Requires
pressure testing to determine airtightness.
All
rooms must be served by return air ducts, or be provided with "uncloseable
openings" (grilles, etc.)
Floor
registers or grilles must be able to resist structural failure in a
200 lb. concentrated load test.
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| CABO |
MHCSS |
| Combustion
Air and Venting |
| Allows
combustion air supply to be entirely from the interior, exterior, or
a combination of both, based on the airtightness of the home.
Oil-fired
appliances are required to have a draft regulator connected to the
chimney.
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Requires
the complete separation of combustion air and interior air, by 1)
direct vent appliances, OR 2) installation in enclosures sealed from
the interior air.
MHCSS does not address.
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| CABO |
MHCSS |
| Air
Conditioning |
Piping
must be insulated to prevent condensation.
CABO does not address.
AC systems to have EERs between 9.7 and 10.0.
Heat pumps to have a coefficient of performance of 2.9 (47 F) and
2.0 (17 F)
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MHCSS
does not address.
XXXXXXXXXXXXXXXXXX
On combination systems,
requires dampers and controls to separate and prevent simultaneous
operation of heating and cooling systems. Heat pumps must
provide 60% of annual heating by compressions.
AC systems to have EER of not less than 7.2.
Heat pumps to have a coefficient of performance of 2.5 (47 F) and
1.7 (17 F). |
| CABO |
MHCSS |
| Fuel
and Gas Piping and Storage Systems |
Gas
piping systems are visually inspected, but are not required to be
pressure tested.
Allows used materials in gas piping systems.
Each gas appliance requires a separate shut-off valve.
Allows plastic piping and fittings in gas piping.
Joints in concealed locations must be brazed.
CABO places less emphasis on some
aspects of LP-gas systems.
CABO places more emphasis on
fuel oil systems, specifying tank materials, types of pumps, and
maximum pressure of fuel lines.
CABO does not address.
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Requires
pressure testing of gas piping systems to inspect for leakage.
Does not allow used materials in gas piping systems.
Shut-off valves may
serve more than one appliance under certain conditions.
Does not allow plastic components in gas piping.
Does not allow joints in concealed locations, and prohibits
tubing inside walls, floors, or in roofs.
MHCSS places more emphasis on LP-gas
systems, specifying connectors, safety devices, service pressure,
constructions of containers, and mountings.
MHCSS places less emphasis on some
aspects of fuel oil systems.
Fuel oil systems must contain
an oil filter, and be tested for leakage prior to operation.
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