Project Name
Project Number
UEPH Complex
Statement of Work
26 November 2001
10-10.3
Return/exhaust registers and grilles. Grilles shall be fixed horizontal or vertical louver
type similar in appearance to the supply diffuser face. Registers shall be provided with integral
opposed blade damper. Plastic units are prohibited. Core velocity shall be limited to 2 m/sec
[400 fpm] maximum, with a maximum pressure drop of 0.5 Pa/m [0.06 inch water]. Grilles shall
be provided with sponge-rubber gasket between flanges and wall or ceiling. Register/grille
boots shall be sealed tight to the wall or ceiling they penetrate using duct mastic or caulking.
Wall return grilles shall be located at least 150 mm [6 inches] above the floor or below the
ceiling.
10-10.4
Flexible duct. Shall be limited to runouts, shall be adequately supported to prevent
kinks and shall not exceed 3.2 m [10 feet] in length. Runouts shall be preinsulated, factory
fabricated, and conform with NFPA 90 and UL 181.
10-10.5
Fire dampers. Fire dampers shall be located and installed in accordance with NFPA
requirements, and shall conform to the requirements of UL 555. Fire dampers shall be
automatic operating, and shall be rated for the maximum system velocity and pressure. Fire
dampers shall be equipped with a steel sleeve or adequately sized frame installed in such a
manner that disruption of the attached ductwork, if any, will not impair the operation of the
damper. Dampers shall not reduce the duct or the air transfer opening cross-sectional area.
Access doors shall be provided at all fire dampers.
10-10.6
Balancing dampers. Provide in ducts serving each supply, return and exhaust air
device.
10-10.7
Access doors. Provide in ductwork and plenums at all air flow measuring devices,
automatic dampers, fire dampers, coils, thermostats and other devices requiring service and
inspection.
10-11
HYDRONIC DISTRIBUTION SYSTEMS.
10-11.1
Pumps. Provide [inline] [basemounted] centrifugal pump for each hydronic system
provided. Provide flexible connections and pressure gauges on pump inlet and outlet. [Provide
primary and backup pump for each hydronic system provided.]
10-11.2
Air separator. Provide air separator for each closed hydronic system provided.
10-11.3
Expansion. Provide a [bladder tank] [expansion tank] for each closed hydronic
system provided.
10-11.4
Chemical feed systems. Provide means for chemical treatment for each hydronic
system provided. Provide automatic chemical treatment systems for all open water systems.
Provide initial treatment and one year supply of chemicals for each system provided.
10-11.5
Makeup water. Provide backflow preventers and pressure reducing valves on each
makeup water system provided. Each hydronic system shall have a separate pressure reducing
valve.
10-12
PIPING SYSTEMS. Piping systems shall be in accordance with the following
subparagraphs. Fittings and valves shall be compatible for the piping systems in which installed.
Provide dielectric unions where required. Provide flexible connections where necessary to
prevent vibrations from transmitting from equipment to the piping system. Expansion loops,
SOW-142
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