Complete Compiled Specification.pdf - Peck Ormsby Construction

Ducts at Masonry:
Where ducts are shown connecting to masonry openings and along edges of all plenums at floors and walls,
provide a continuous 2" x 2" x 3/8" galvanized angle iron which shall be bolted to the construction and made
airtight to the same by applying caulking compound. Sheet metal at these locations shall be bolted to the
angle irons.
Installation of Food Preparation Area Ducts:
Connections from ductwork to hoods shall be performed by this section.
Duct systems shall be so constructed and installed that moisture cannot become pocketed in any portion
thereof, and the system shall slope not less than 1/4" per lineal foot towards the hood or toward an approved
grease reservoir. Where horizontal ducts exceed 75 feet in length, the slope shall be not less than one inch
per lineal foot. When a centrifugal fan is used, it shall be positioned so that the discharge outlet is in a
bottom horizontal position and the air shall be so diverted that there will be no impingement on the roof,
other equipment or parts of the structure.
Provide access panels in the ductwork from kitchen hood exhaust fans to allow internal inspection and
cleaning of exhaust ductwork.
Locate not more than 12 feet 0 inches on centers, and at all elbows. Coordinate location of access panels
with available maintenance access space.
STORAGE OF DUCTS:
Ductwork shall be stored in a protected area to prevent physical damage to the duct liner, and to insure that
the duct liner is not exposed to excessive heat or moisture which would deteriorate the air side surface.
Ductwork which has been improperly stored and/or sustained physical damage will be rejected, and shall
be removed from the job site as directed by the Owner's representative.
CLEANING OF DUCTS:
Before ducts are insulated and before the ceiling is installed and final connections made to the terminal
boxes, the fans shall be operated at full capacity to blow out any dirt and debris from ducts. If it is not
practical to use the main supply blower for this cleaning, the ducts may be blown out in sections by a
portable fan. After the ducts have been cleaned and initially pressure tested, the final connection shall be
made to the terminal boxes.
TESTING OF DUCTS:
Supply, return, and exhaust ducts, plenums, and casings operating at duct pressures from +2" to -2" shall be
tested and made substantially airtight at static pressure indicated for the system before covering with
insulation or concealing in masonry. Substantially airtight shall be construed to mean a leakage rate less
than 5% of the rated airflow.
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SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION March 2, 2009
AIR DISTRIBUTION 15800 - 15