Complete Compiled Specification.pdf - Peck Ormsby Construction

INSTALLATION OF DUCTS:
All ducts shall be installed in compliance with the latest editions of the SMACNA manuals.
All necessary allowance and provisions shall be made in the installation of sheet metal ducts for the
structural conditions of the building, and ducts shall be transformed or divided as may be required.
Whenever this is necessary, the required area shall be maintained. All changes, however, must be
approved and installed as directed.
Pre-manufactured ducts shall be connected to rigid ducts and equipment with the solid wraps of fabric duct
tape and tyton bands drawn tight to form an airtight joint.
During the installation, the open ends of all ducts shall be protected by covering with plastic sheet tied in
place to prevent debris and dirt from entering.
Install this work in cooperation with other trades so that there will be no delay in progress of construction
work. It is extremely important that the duct system be clean before connections are made to the VAV
boxes.
The contractor shall take special care when running exposed ductwork to insure that the final installation is
neat in appearance.
Spiral ducts running exposed in occupied areas shall be hung with an aircraft cable type hanger.
Under no circumstances shall ductwork be supported from the metal roof deck.
Ceiling outlets shall be rigidly supported from the overhead structure with G.I. wires or straps, or from rigid
galvanized iron ductwork. Outlets shall not be supported from T-bar ceilings or metal roof deck.
Hanger and Supports:
Hangers for ducts up to 18" in width shall be placed on not more than 8'-0" centers. Ducts 19" and over in
width shall be supported on not more than 4'-0" centers. Hangers shall be placed plumb and present a near
appearance. Construct hangers from galvanized band iron 1" x 1/8" for duct up to 36" wide. Hangers shall
extend down the sides of the ducts not less than 9". On ducts less than 9" in depth, hangers shall extend
the full depth of the ducts. Attach hangers to ducts using not less than three rivets or parker screws of
appropriate sizes. It is essential that all ducts be rigidly supported. Where vertical ducts pass thru floors or
roofs, supporting angles shall be rigidly attached to ducts and to the structure. Angles shall be galvanized
and of sufficient size to support the ductwork rigidly. Place supporting angles on at least two sides of the
duct. For round ducts, strap hangers shall extend completely around ducts.
Ceiling outlets shall be rigidly supported from the overhead structure with G.I. wires on straps, or from rigid
galvanized iron ductwork. Outlets shall not be supported from T-bar ceilings unless approved by the
owner's representative.
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SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION March 2, 2009
AIR DISTRIBUTION 15800 - 14