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Document
159
Office of Asst. Sec. for Housing, HUD
§ 3280.602
structure of the home. Central air condi-
tioners operate most efficiently and provide
the greatest comfort when their capacity
closely approximates the calculated cooling
load. Each homes air conditioner should be
sized in accordance with chapter 22 of the
American Society of Heating, Refrigerating
and Air Conditioning Engineers (ASHRAE)
Handbook of Fundamentals, 1989 Edition,
once the location and orientation are known.
I
NFORMATION
P
ROVIDED
BY
THE
M
ANUFAC
-
TURER
N
ECESSARY
T
O
C
ALCULATE
S
ENSIBLE

H
EAT
G
AIN

Walls (without windows and doors) .............................
U
Ceilings and roofs of light color ...................................
U
Ceilings and roofs of dark color ..................................
U
Floors ...........................................................................
U
Air ducts in floor ...........................................................
U
Air ducts in ceiling .......................................................
U
Air ducts installed outside the home ...........................
U
Information necessary to calculate duct
areas.
[40 FR 58752, Dec. 18, 1975. Redesignated at 44
FR 20679, Apr. 6, 1979, as amended at 58 FR
55012, Oct. 25, 1993]
Subpart GPlumbing Systems
§ 3280.601
Scope.
Subpart G of this standard covers the
plumbing materials, fixtures, and
equipment installed within or on man-
ufactured homes. It is the intent of
this subpart to assure water supply,
drain, waste and vent systems which
permit satisfactory functioning and
provide for health and safety under all
conditions of normal use.
§ 3280.602
Definitions.
The following definitions are applica-
ble to subpart G only:
Accessible, when applied to a fixture,
connection, appliance or equipment,
means having access thereto, but
which may require removal of an ac-
cess panel or opening of a door.
Air gap (water distribution system)
means the unobstructed vertical dis-
tance through the free atmosphere be-
tween the lowest opening from any
pipe or faucet supplying water to a
tank, plumbing fixture, water supplied
appliances, or other device and the
flood level rim of the receptacle.
Anti-siphon trap vent device means a
device which automatically opens to
admit air to a fixture drain above the
connection of the trap arm so as to pre-
vent siphonage, and closes tightly
when the pressure within the drainage
system is equal to or greater than at-
mospheric pressure so as to prevent the
escape of gases from the drainage sys-
tem into the manufactured home.
Backflow means the flow of water or
other liquids, mixtures, or substances
into the distributing pipes of a potable
supply of water from any source or
sources other than its intended
sources.
Backflow connection means any ar-
rangement whereby backflow can
occur.
Backflow preventer means a device or
means to prevent backflow.
Branch means any part of the piping
system other than a riser, main or
stack.
Common vent means a vent con-
necting at the junction of fixture
drains and serving as a vent for more
than one fixture.
Continuous vent means a vertical vent
that is a continuation of the drain to
which it connects.
Continuous waste means a drain from
two or more fixtures connected to a
single trap.
Critical level means a point estab-
lished by the testing laboratory (usu-
ally stamped on the device by the man-
ufacturer) which determines the min-
imum elevation above the flood level
rim of the fixture or receptacle served
on which the device may be installed.
When a backflow prevention device
does not bear a critical level marking,
the bottom of the vacuum breaker,
combination valve, or of any such ap-
proved or listed device shall constitute
the critical level.
Cross connection means any physical
connection or arrangement between
two otherwise separate systems or
sources, one of which contains potable
water and the other either water,
steam, gas or chemical of unknown or
questionable safety whereby there may
be a flow from one system or source to
the other, the direction of flow depend-
ing on the pressure differential be-
tween the two systems.
Developed length means that length of
pipe measured along the center line of
the pipe and fittings.
Diameter, unless otherwise specifi-
cally stated, means the nominal (in-
side) diameter designated commer-
cially.
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24 CFR Ch. XX (4106 Edition)
§ 3280.602
Drain means a pipe that carries
waste, water, or water-borne waste in a
drainage system.
Drain connector means the removable
extension, consisting of all pipes, fit-
tings and appurtenances, from the
drain outlet to the drain inlet serving
the manufactured home.
Drain outlet means the lowest end of
the main or secondary drain to which a
sewer connection is made.
Drainage system means all piping
within or attached to the structure
that conveys sewage or other liquid
waste to the drain outlet, not including
the drain connector.
Fixture drain means the drain from
the trap of a fixture to the junction of
that drain with any other drain pipe.
Fixture supply means the water sup-
ply pipe connecting a fixture to a
branch water supply pipe or directly to
a main water supply pipe.
Flood-level means the level in the re-
ceptacle over which water would over-
flow to the outside of the receptacle.
Flooded means the condition which
results when the liquid in a container
or receptacle rises to the flood-level.
Flush tank means that portion of a
water closet that is designed to contain
sufficient water to adequately flush the
fixture.
Flush valve means a device located at
the bottom of a flush tank for flushing
a water closet.
Flushometer tank: means a device in-
tegrated within an air accumulator
vessel which is designed to discharge a
predetermined quantity of water to fix-
tures for flushing purposes.
Flushometer valve means a device
which discharges a predetermined
quantity of water to a fixture for flush-
ing purposes and is closed by direct
water pressure.
Grade means the fall (slope) of a pipe
in reference to a horizontal plane ex-
pressed in inches per foot length.
Horizontal branch means any pipe ex-
tending laterally, which receives the
discharge from one or more fixture
drains and connects to the main drain.
Horizontal pipe means any pipe or fit-
ting which makes an angle of not more
than 45 degrees with the horizontal.
Individual vent means a pipe installed
to vent a fixture drain.
Inlet coupling means the terminal end
of the water system to which the water
service connection is attached. It may
be a swivel fitting or threaded pipe end.
Main means the principal artery of
the system to which branches may be
connected.
Main drain means the lowest pipe of a
drainage system which receives sewage
from all the fixtures within a manufac-
tured home and conducts these wastes
to the drain outlet.
Main vent means the principal artery
of the venting system to which vent
branches may be connected.
Offset means a combination of pipe
and/or fittings that brings one section
of the pipe out of line but into a line
parallel with the other section.
Pitch. See Grade.
Plumbing appliance: means any one of
a special class of plumbing fixture
which is intended to perform a special
plumbing function. Its operation and/or
control may be dependent upon one or
more energized components, such as
motors, control, heating elements, or
pressure or temperature-sensing ele-
ments. Such fixture may operate auto-
matically through one or more of the
following actions: A time cycle, a tem-
perature range, a pressure range, a
measured volume or weight, or the fix-
ture may be manually adjusted or con-
trolled by the user or operator.
Plumbing appurtenance: means a man-
ufactured device, or a prefabricated as-
sembly, or an on-the-job assembly of
component parts, and which is an ad-
junct to the basic piping system and
plumbing system and plumbing fix-
tures. An appurtenance demands no ad-
ditional water supply, nor does it add
any discharge load to a fixture or the
drainage system.
Plumbing fixtures means receptacles,
devices, or appliances which are sup-
plied with water or which receive liq-
uid or liquid-borne wastes for discharge
into the drainage system.
Plumbing system means the water sup-
ply and distribution pipes; plumbing
fixtures, faucets and traps; soil, wa