substitution request - Alliance Construction Solutions

PART 1 – GENERAL
1.01 DESCRIPTION OF WORK:
Project No.: 10145
550 15 th Street Dual Brand Hotel
03/16/2012
SECTION 23 3113
METAL DUCTS
A. Extent of metal ductwork is indicated on drawings and in schedules, and by requirements
of this Section.
DUCT SERVICE TYPE/CONSTRUCTION
Supply air between fans and terminal units
(medium and high pressure).
Supply air from discharge of terminal units/fans
to air devices (low pressure).
Galvanized steel; spiral, round, oval, or
rectangular (lined where noted on drawings);
factory fabricated.
Galvanized sheet metal; spiral, round, oval or
rectangular (lined where noted on drawings);
factory or shop fabricated.
Return air ductwork. Galvanized sheet metal (lined where noted on
drawings); factory or shop fabricated.
General building exhaust. Galvanized sheet metal (lined where noted on
drawings); factory or shop fabricated.
Transfer ducts. Galvanized sheet metal, internally lined, as
described above for low-pressure supply;
factory or shop fabricated.
Sound elbows for R.A. grilles Galvanized sheet metal (internally lined).
OR
Fibrous glass ductboard.
Outdoor air intake ductwork. Galvanized sheet metal, rectangular; factory or
shop fabricated.
Exterior uninsulated ductwork. Aluminum, 304 SS, or painted galvanized steel.
Pool room supply/Exhaust, Shower, locker room Aluminum with silicone sealant.
exhaust.
B. Exterior insulation of metal ductwork is specified in other Division 23 sections, and is
included as work of this section.
C. Refer to other Division 23 sections for ductwork accessories.
D. Refer to other Division 23 sections for fans and air handling units.
E. Refer to other Division 23 sections for testing, adjusting, and balancing of metal ductwork
systems.
1.02 DEFINITIONS:
A. Low Pressure Duct: Duct required by the drawings, specifications, or referenced standards
to be constructed to 2” w.g. or less positive or negative pressure class.
23 3113 - 1 METAL DUCTS