Project Name
Project Number
TEMF
Statement of Work
UFC 4-214-02, 24 Jul 03
be provided. Air intakes shall be placed at the highest practical level in the building. Intakes
shall be covered with screens to prevent insects and foreign objects from entering.
10-10.1
Ductwork. All ductwork including fittings and components shall conform to SMACNA
HVAC Duct Construction Standards. Seal class shall be as recommended by SMACNA.
[Internally lined ductwork shall not be allowed.] Pressure sensitive tape shall not be used as a
sealant. Ductwork leak test shall be performed for the entire air distribution and exhaust
system, including fans, coils, [filters, etc.] [filters, etc. designated as static pressure Class 750
Pa through Class 2500 Pa. Test procedure, apparatus, and report shall conform to SMACNA
Leakage Test Manual. The maximum allowable leakage rate is [_____] l/s. Ductwork leak test
shall be completed with satisfactory results prior to applying insulation to ductwork exterior.
10-10.2
Supply diffusers and registers. Diffusers shall be located to ensure that the air
distribution will completely cover all surfaces of exterior walls with a blanket of conditioned air or
may be of a compact design so long as 'dead spots' within the units are avoided. Diffusers
shall be provided with integral opposed blade damper. Diffusers shall be provided with air
deflectors as required for proper air flow in the space. Plastic diffusers are prohibited. Core
velocity shall be limited to 3 m/sec maximum, with a maximum pressure drop of 25 Pa. Ceiling
mounted units shall have factory finish to match ceiling color, and be installed with rims tight
against ceiling. Sponge-rubber gaskets shall be provided between ceiling or wall and surface-
mounted diffusers for air leakage control. Diffuser boots shall be sealed tight to the wall or
ceiling they penetrate using duct mastic or caulking. Suitable trim shall be provided for flush-
mounted diffusers. Duct collar connecting the duct to diffuser shall be airtight and shall not
interfere with volume controller. Wall supply registers shall be installed at least 150 mm below
the ceiling.
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 maximum, with a maximum pressure drop of 15 Pa. 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 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 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
90A, 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
SOW-97
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