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DEFINITIONS

COMBUSTION CHAMBER. The portion of an appliance appliance(s), or it could be free-standing with a back panel
within which combustion occurs. from the rear of the appliances to the hood. It overhangs
the front and sides of the appliance(s) on all open sides.
COMBUSTION PRODUCTS. Constituents resulting from
the combustion of a fuel with the oxygen of the air, including The wall acts as a back panel, forcing the makeup air to
the inert gases, but excluding excess air. be drawn across the front of the cooking equipment, thus
increasing the effectiveness of the hood to capture and
COMMERCIAL COOKING APPLIANCES. Appliances
used in a commercial food service establishment for heating contain effluent generated by the cooking operation(s).
or cooking food. For the purpose of this definition, a com- COMPENSATING HOODS. Compensating hoods are
mercial food service establishment is where food is prepared those having integral (built-in) makeup air supply. The
for sale or is prepared on a scale that is by volume and fre- makeup air supply for such hoods is generally supplied from:
quency not representative of domestic household cooking. short-circuit flow from inside the hood, air curtain flow from
COMMERCIAL COOKING RECIRCULATING SYS- the bottom of the front face, and front face discharge from the
TEM. Self-contained system consisting of the exhaust hood, outside front wall of the hood. The compensating makeup air-
the cooking equipment, the filters and the fire suppression flow can also be supplied from the rear or side of the hood, or
system. The system is designed to capture cooking vapors the rear, front or sides of the cooking equipment. The makeup
and residues generated from commercial cooking equipment. airflow can be one or a combination of methods.
The system removes contaminants from the exhaust air and COMPRESSOR. A specific machine, with or without acces-
recirculates the air to the space from which it was withdrawn. sories, for compressing a gas.
COMMERCIAL KITCHEN HOODS. COMPRESSOR, POSITIVE DISPLACEMENT. A com-
pressor in which increase in pressure is attained by changing
Backshelf hood. A backshelf hood is also referred to as a
low-proximity hood, or as a sidewall hood where wall the internal volume of the compression chamber.
mounted. Its front lower lip is low over the appliance(s) COMPRESSOR UNIT. A compressor with its prime mover
and is “set back” from the front of the appliance(s). It is and accessories.
always closed to the rear of the appliances by a panel CONCEALED LOCATION. A location that cannot be
where free-standing, or by a panel or wall where wall accessed without damaging permanent parts of the building
mounted, and its height above the cooking surface varies. structure or finish surface. Spaces above, below or behind
(This style of hood can be constructed with partial end readily removable panels or doors shall not be considered as
panels to increase its effectiveness in capturing the efflu- concealed.
ent generated by the cooking operation).
CONDENSATE. The liquid that condenses from a gas
Double island canopy hood. A double island canopy (including flue gas) caused by a reduction in temperature.
hood is placed over back-to-back appliances or appliance
CONDENSER. A heat exchanger designed to liquefy refrig-
lines. It is open on all sides and overhangs both fronts and
the sides of the appliance(s). It could have a wall panel erant vapor by removal of heat.
between the backs of the appliances. (The fact that exhaust CONDENSING UNIT. A specific refrigerating machine
air is drawn from both sides of the double canopy to meet combination for a given refrigerant, consisting of one or more
in the center causes each side of this hood to emulate a power-driven compressors, condensers and, where required,
wall canopy hood, and thus it functions much the same liquid receivers, and the regularly furnished accessories.
with or without an actual wall panel between the backs of CONDITIONED SPACE. An area, room or space that is
the appliances).
enclosed within the building thermal envelope and that is
Eyebrow hood. An eyebrow hood is mounted directly to directly heated or cooled or that is indirectly heated or cooled.
the face of an appliance, such as an oven and dishwasher, Spaces are indirectly heated or cooled where they communi-
above the opening(s) or door(s) from which effluent is cate through openings with conditioned spaces, where they
emitted, extending past the sides and overhanging the are separated from conditioned spaces by uninsulated walls,
front of the opening to capture the effluent. floors or ceilings, or where they contain uninsulated ducts,
Pass-over hood. A pass-over hood is a free-standing form piping or other sources of heating or cooling.
of a backshelf hood constructed low enough to pass food [A] CONSTRUCTION DOCUMENTS. The written,
over the top. graphic and pictorial documents prepared or assembled for
describing the design, location and physical characteristics of
Single island canopy hood. A single island canopy hood
is placed over a single appliance or appliance line. It is the elements of the project necessary for obtaining a building
permit. The construction drawings shall be drawn to an
open on all sides and overhangs the front, rear and sides of
appropriate scale.
the appliance(s). A single island canopy is more suscepti-
ble to cross drafts and requires a greater exhaust air flow CONTROL. A manual or automatic device designed to regu-
than an equivalent sized wall-mounted canopy to capture late the gas, air, water or electrical supply to, or operation of,
and contain effluent generated by the cooking opera- a mechanical system.
tion(s).
CONVERSION BURNER. A burner designed to supply
Wall canopy hood. A wall canopy exhaust hood is gaseous fuel to an appliance originally designed to utilize
mounted against a wall above a single appliance or line of another fuel.

2018 INTERNATIONAL MECHANICAL CODE  11
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