Complete Compiled Specification.pdf - Peck Ormsby Construction

PRE-MANUFACTURED DUCTS:
Runouts above ceiling from primary supply air ducts to VAV terminal boxes may be rigid conduit or premanufactured
high pressure flex duct or a combination of the two.
Runouts above ceiling from the terminal boxes to the ceiling diffusers shall be similar to "Genflex - Type IL".
Maximum allowance length is 5'-0" in any given duct run. Duct to be factory fabricated with spring steel wire
helix and 1" thick glass fiber insulation covered with external vapor barrier and lined with continuous nonperforated
inner sleeve.
Material shall comply with UMC Standard 10-1.
RECTANGULAR DUCT LINING:
The interior surface of all rectangular supply, return, make-up, outdoor, fresh, relief, and exhaust air ducts
(except where noted otherwise), shall be lined with 1" thick fiberglass dual density duct liner, having an
average "K" factor of .24 BTU at 75 deg. F mean. The liner shall meet standards NFPA No. 90A and No.
90B and shall have the Underwriters' Laboratories, Inc., label.
Duct liner shall be applied to the flat sheet with a 100% coverage of duct adhesive. The duct liner shall be
cut to assure snug corner joints. The black surface of the liner shall face the air stream. On horizontal runs,
tops of ducts over 12" in width and sides over 16" in height shall be additionally secured with welded pins
and speed clips on a maximum of 15" centers. On vertical runs, gripnails or welded pins and speed clips
shall be spaced on a maximum of 15" centers on all width dimensions over 12". Pins shall start within 2" of
all cross joints within the duct section.
Welded pins shall be cut virtually flush with the liner surface. Clips should be drawn down flush only and not
so as to compress the liner and cause the leading edge of raise. All exposed edges and the leading edge of
all cross joints of the liner shall be coated with adhesive.
Material shall comply with UMC Standard 10-1.
BOILER STACKS & BREECHINGS:
Stack shall be double wall insulated positive pressure type as shown on plans, with necessary wall brackets,
tee sections, cleanout doors, section bands, trim and fittings for a complete installation. Stack shall have 1"
insulation, stainless steel liner and aluminized steel shell coated for field painting by the painting contractor.
Stack shall be Metalbestos Model PS (UL listed).
REGISTERS, GRILLES AND DIFFUSERS:
Supply Air Diffusers:
Furnish and install all supply air diffusers shown and specified on the drawings. All units to have opposed
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SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION March 2, 2009
AIR DISTRIBUTION 15800 - 6