vibrations under all conditions of operation. Supply and installation of
exhaust fans for food service equipment and exhaust hoods shall be as
specified in Section [_____].
2.8.1
Condensate Exhaust Hood Connection Provisions
2.8.1.1
Exhaust Duct for Canopy or Noncanopy Condensate Hoods
Ducts shall be constructed of 1.3 mm (18 gauge) 18 gauge stainless steel.
External seams shall be welded and liquid-tight. Duct size shall be based
on a minimum air velocity of 4.06 meter/second 800 fpm. Duct shall be
continuously welded, liquid tight, to hood duct collar as required by NFPA
96.
2.8.1.2
Hood Support
Wall mounted or island type hoods shall be supported from the ceiling
structure with stainless steel mounting brackets provided with the hoods.
Hanger rods shall be 13 mm 1/2 inch diameter stainless steel, threaded at
the bottom and designed at the top to fit into inserts in building slats
above or hanger attachments fastened to structural steel members. Hanger
rods shall be spaced 1200 mm 48 inches on center, maximum.
2.8.1.3
Make-Up Air Tempered and/or Untempered
The air volume which is exhausted from a kitchen shall be replaced as
required by NFPA 96. Air supplied upstream of the hood suction opening
does not qualify as make-up air. The exhaust air flow rate of ventilation
of dishwash equipment shall be drawn through the open area between the
dishwash machine and the perimeter entrance of the hood. Make-up air
diffusers shall be provided the full length of the front panels, at both
sides of the hood producing a low velocity discharge. The supply air
plenum shall have 25 mm 1 inch thick foil-faced fiberglass insulation at
interior of plenum. The temperature differential between make-up air and
the air in the conditioned space shall not exceed 12 degrees C 10 degrees F,
except air that is part of the air conditioning system or air that does not
decrease comfort conditions of the occupied space.
2.8.1.4
Hood Lights and Wiring
U.L. listed, recess mounted, gasketed vapor-proof fluorescent light
fixtures shall be provided the full length of the hood as shown on the
drawings. The light fixtures shall be prewired to junction box at a rear
free corner. A Cool white T-8 energy efficient lamps shall be used.
2.8.1.5
Closure Panels
Vertical corner mullions shall be provided at removable closure panels, 50
by 50 mm 2 by 2 inch wide, 1.6 mm (16 gauge) 16 gauge stainless steel, and
shall be welded integrally to furring and head channel. Exhaust hood
closure panels shall be 13 mm 1/2 inch pan-formed 1.3 mm (18 gauge) 18 gauge
stainless steel. The upper edge of the panel shall be retained in a 25 by
50 mm 1 by 2 inch continuous 1.6 mm (16 gauge) 16 gauge stainless steel
head channel secured to the hood superstructure. The lower edge of the
panels shall be mounted on perimeter furring cap, and shall be turned back
25 mm 1 inch for "zee" clip retention.
SECTION 11400A
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