ahead of the hood control panel. The wash water and grease shall be
collected within the hood(s), piped to the outside of the hoods, and
interconnected to the building plumbing system through an air-gap hub
assembly. Main supply water piping shall include a quarter turn ball-type
shut-off valve conforming to MSS SP-72 or MSS SP-110 as applicable. As a
minimum, a temperature/pressure gauge, water hammer arrester, line
strainer, solenoid valve, flow check valve, detergent inlet fitting with
check valve, detergent pump, detergent tank, and pump test switch shall be
provided with the system. Controls, plumbing, and detergent components
shall be located [within the utility distribution system] [within a factory
prewired control enclosure where indicated on the drawings]. One control
enclosure shall be provided for each exhaust hood or group of hoods served
by a common exhaust fan. A vacuum breaker shall be furnished for the
hot-water/detergent supply line from the control enclosure to the hood
connection point. System operation shall be by a control system, including
indicator lights, [timing relay adjustable from a minimum of 1 to 10
minutes] [programmable clock timer], control relays and terminal blocks.
"START" button shall start the exhaust fan and "STOP" button shall stop the
exhaust fan and activate the timed wash cycle. System shall be capable of
being activated either manually or thermostatically in the event of a fire.
2.7.9.4
Internal Hood Fire Protection
Grease extracting hoods shall be furnished with piping and nozzles for a
fire protection system providing protection of the exhaust hood system,
grease extractor, exhaust duct system, and the cooking equipment served by
the exhaust hood, per NFPA 96. Exposed piping and fittings shall be
chrome-plated or stainless steel sleeved. Each grease extracting hood
control panel shall be provided with a manual pull fire switch to activate
the automatic washdown system and exhaust fan. Each hood shall be equipped
with a full length, stainless steel fire damper located at the air inlet.
In the event that a fire or heat in excess of 141 degrees C 286 degrees F
in the exhaust duct collars exists, a thermal switch shall automatically
close the fire damper, turn on the automatic washdown system and turn off
the exhaust and supply fans. The washdown system shall remain on as long
as the thermostat is above it's activation temperature and once below that
temperature run for an additional five minutes. Fire dampers shall be able
to be open with a reset handle without the removal of access panels. Reset
handle shall be located not greater than 2.1 m 7 feet above the finished
floor. The controls for the hood fire protection system shall be equipped
with switches to shut-off fuel-fired and electric-powered cooking equipment
served by the hood, when the internal hood fire protection system is
activated. The hood fire protection system shall be equipped with
normally-open contacts for activating the building fire alarm system.
2.8
CONDENSATE HOODS
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NOTE: Designer will indicate type, size, shape, and
detail of hoods/ducts, and the required standard
cubic meters per second (cubic feet per minute),
meters per second (feet per minute) (velocity),
static pressure, and duct collar size for
exhaust/make-up air on the drawings.
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Hood and duct work systems shall conform to ACGIH-2092M ACGIH-2092S, SMACNA
HVAC Duct Const Stds, and NFPA 96. Unless otherwise specified, ducts and
hoods shall be secured to building so as to be level and free from
SECTION 11400A
Page 30
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