2.7.1.8
Air-Curtain Fans
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NOTE: Provide air curtains designed as fly fans on
all exterior entranceways to food preparation areas,
except where the entranceway is to be used only as
an emergency exit. Include air curtains for service
windows and service entries whenever feasible on the
exterior of the entranceway. When air curtains are
mounted in locations significantly above normal door
heights, verify curtain air velocities and noise
levels.
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Fans shall conform to AMCA 220 with AMCA seal. Furnish air curtains with a
weatherproof housing constructed of high impact plastic or minimum 1.3 mm
18 gauge rigid welded steel. Fan wheels shall be backward curved,
non-overloading, centrifugal type and accurately balanced statically and
dynamically. Motors shall have totally enclosed fan cooled enclosures.
Motor starters shall be remote manual type with weather-resistant enclosure
actuated when the doorway served is open. The air curtains shall attain
the air velocities specified within 2 seconds following activation.
Provide bird screens at air intake and discharge openings. Air curtain
unit or a multiple unit installation shall be at least as wide as the
opening to be protected. Provide the air discharge openings to permit
outward adjustment of the discharge air. Adjustment and installation
placement shall be according to the manufacturer's written recommendation.
Furnish directional controls on air curtains for service windows for easy
clean or convenient removal. Air curtains shall be designed to prevent the
adjustment of the air velocities specified. The interior surfaces of the
air curtain units shall be accessible for cleaning. Provide certified test
data indicating that the fan will provide the air velocities required when
fan is mounted as indicated. Provide air curtains designed as fly fans
unless otherwise indicated. [Air curtains designed for use in service
entranceways shall develop an air curtain not less than 75 mm 3 inches
thick at the discharge nozzle. The air velocity shall be not less than 8
m/s 1600 fpm across the entire entryway when measured 900 mm 3 feet above
the floor.] [Air curtains designed for use on customer entranceways shall
develop an air curtain not less than 200 mm 8 inches thick at the discharge
opening. The velocity shall be not less than 3 m/s600 fpm across the
entire entryway when measured 900 mm 3 feet above the floor. Recirculating
type air curtains shall be equipped with readily removable filters, or the
filters shall be designed for in-position cleaning. The air capture
compartment shall be readily accessible and easily cleanable or designed
for in-position cleaning.] [Air curtains designed for use on service
windows shall develop an air curtain not less than 200 mm 8 inches thick at
the discharge opening. The air velocity shall be not less than 3 m/s 600
fpm across the entire opening of the service window measured 900 mm 3 feet
below the air discharge opening.]
2.7.1.9
Ceiling Exhaust Fans
Suspended cabinet-type ceiling exhaust fans shall be centrifugal type,
direct-driven. Fans shall have acoustically insulated housing. Integral
backdraft damper shall be chatter-proof. The integral face grille shall be
of egg-crate design or louver design. Mount fan motors on vibration
isolators. Furnish unit with mounting flange for hanging unit from above.
Fans shall be U.L. listed.
SECTION 15895
Page 30
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