Complete Compiled Specification.pdf - Peck Ormsby Construction

Ducts, unless otherwise approved, shall conform accurately to the dimensions indicated on the drawings,
and shall be straight and smooth on the inside with joints neatly finished. All duct sizes shown on the
drawings are free area inside dimensions. Acoustically-lined ducts shall have outside dimensions increased
as
required to accommodate the acoustic lining specified and still maintain the free area inside dimensions
shown on the drawings.
Under no circumstances shall the cross section of any duct be decreased by dents, pipes, or hanger rods
running through it unless otherwise indicated on the drawings. Neither shall the shape be changed without
approval. No abrupt transitions that restrict the area shall be used. Where necessary to gain clearance, the
duct seams may be turned inside. Structural and Architectural drawings shall be consulted for areas with
restrictive clearances.
FIELD VERIFICATION:
No ductwork shall be fabricated without first field verifying that the available space (under actual job
conditions) will permit installation of the ductwork without structural or other conflicts.
FLEXIBLE CONNECTION:
This contractor shall provide flexible connections not less than 4 inches wide, constructed of heavy,
waterproof, woven plastic-coated glass fabric at the inlet and outlet connections of each fan unit, securely
fastened to the unit and to the ductwork by a galvanized iron band, and provided with tightening screws.
Corners shall be sewn tight shut.
+4" PRESSURE CLASS FLEXIBLE CONNECTIONS:
This flexible connection between the +4" P.C. ductwork and VAV boxes or fans shall be fabricated of
neoprene-coated 1/8 inch glass fabric sheets with the ends vulcanized together. The flexible connection
shall be securely attached to the fan and ductwork with heavy iron draw bands. Connections shall be 30ounce
Ventglass.
AIR FLOW MEASURING DEVICES:
The sheet metal contractor shall install the air flow measuring devices as specified in Section 15900. The
devices will be furnished by the control contractor.
BELT GUARDS:
Belt guards shall be fabricated and installed. Guards shall be constructed of 10-gauge wire, 1-inch mesh in
1-1/2 inch angle-iron welded frames. All guards shall be provided with an opening for a tachometer and
shall be either the split type or easily removable for belt repair. The guards shall be anchored securely to
the floor or walls to prevent any vibration.
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SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION March 2, 2009
AIR DISTRIBUTION 15800 - 5