Project Name
Project Number
UEPH Complex
Statement of Work
26 November 2001
closed duct leakage shall not exceed 2 percent of maximum rated air volume. Unit air volume
shall be factory preset and readily field adjustable without special tools. Acoustic performance of
the terminal units shall be based upon units tested according to ARI 880. Acoustical lining shall
be according to NFPA 90A.
10-6.4
Unit ventilators. Unit ventilators shall be of the year-round classroom type with
automatic controls arranged to properly heat, cool, and ventilate the room. Automatic valves
and controls shall be provided. Enclosures shall be fabricated of not lighter than 16 gauge
galvanized steel, reinforced and braced, or all welded framework with panels to provide
equivalent strength. The casing shall be acoustically and thermally insulated internally with not
less than 1/2 inch thick dual density fibrous glass insulation. Removable panels or access doors
shall be provided for all piping and control compartments. Gaskets shall be provided at the back
and bottom of the unit for effective air seal, as required. Fans shall be of galvanized steel or
aluminum, multiblade, centrifugal type, direct connected, dynamically and statically balanced.
Drain and drip pans shall be sized and located to collect all condensed water dripping from any
item within the unit enclosure. An outside air proportioning damper shall be provided on each
unit. In addition, a vane shall be provided to prevent excessive outside air from entering unit
and to prevent blow-through of outside air through the return air grille under high wind
pressures. Where outside air and recirculated air proportioning dampers are provided on the
unit, an additional vane will not be required. Face and bypass dampers shall be provided for
each unit to ensure constant air volume at all positions of the dampers. Each unit shall be
provided with a factory installed control cam assembly, pneumatic motor, or electric motor to
operate the face and bypass dampers and outside air damper or outside air and recirculated air
dampers. Motors shall be of the permanent split-capacitor type with built-in thermal overload
protection and automatic reset. Motor shall be mounted on a resilient mounting, isolated from
the casing and shall be suitable for operation on electric service available. A manually operated
motor switch shall provide for 2 or 3 speeds. In lieu of speed control, a solid state variable
speed controller having minimum speed reduction of 50 percent may be provided. Outside air
intakes shall be the manufacturer's standard design and provided with 12 mm [1/2 inch] mesh
bird screen or louvers on 12 mm [1/2 inch] centers.
10-6.5
Induction units. Unit shall include air plenums, air-discharge nozzles, air discharge
grilles, recirculation grilles, water coil assembly, valve and piping package, condensate drain
pan, filters and adjustable air-balancing dampers, plus an enclosure for cabinet models and
casing for concealed models. Automatic valves and controls shall be provided. Each unit shall
be secured to the building structure. The induction units shall conform to the provisions of ARI
445. Enclosures shall be fabricated of not lighter than 18 gauge steel, reinforced and braced.
Front panel of enclosure shall be removable and insulated when required acoustically and to
prevent condensation. Plastic discharge and return grilles are not acceptable. Access doors
shall be provided for all piping and control compartments. An adjustable air-balancing damper
shall be provided in each unit. Drain and drip pans shall be sized and located to collect
condensed water dripping from any item within the unit enclosure. Drain pans shall be
constructed of not lighter than 21 gauge steel, galvanized after fabrication, and thermally
insulated to prevent condensation.
10-6.6
Exhaust fans. Fans shall be centrifugal [or propellar] type, roof or wall mounted,
direct or V-belt driven with backward inclined, non-overloading wheel. Motor compartment
housing shall be hinged or removable and weatherproof, constructed of heavy gauge aluminum.
Fans shall be provided with birdscreen, disconnect switch, gravity or motorized dampers. Roof
mounted units shall be provided with roof curb. Lubricated bearings shall be provided. Fans
shall be tested and rated according to AMCA 210. [Grease-laden kitchen exhaust fans shall be
SOW-134
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