15840-5
DUCTWORK AND DEVICES
flashings and make waterproof. Flashing shall conform to Division 7.
Cleaning of Duct System: After completing installation of ductwork, clean the entire
system of rubbish, plaster, dirt and any other debris. After installation of equipment
and connections are made to fan, and before any grilles, outlets or registers are
installed, blow out the entire system with dampers and outlets wide open.
3.2 QUALITY CONTROL
A.
Tests: Upon completion and prior to acceptance of the installation, perform the
following tests:
1. Low Velocity Ductwork: Test and make substantially airtight all supply,
return, and exhaust ducts, plenums, and casings, at the static pressure
indicated for the system before covering with insulation or concealing in
masonry. Substantially airtight shall be construed to mean that no air leakage
is noticeable through the senses of feeling or hearing at all duct joints.
Preliminary Tests: Give the air supply and distribution system and its components
an operational test for a period of not less than 4 hours.
After preliminary test, adjust, test and balance the air supply and distribution system
to obtain air volumes as shown on the Drawings. Record final balanced air
quantities and submit to the Engineer for approval.
Provide necessary samples from installed ductwork as Engineer may require (not to
exceed 10) for inspection purposes. Patch all openings due to the removal of the
samples at no additional cost to the Owner.
3.3 SHEET METAL THICKNESS TABLES
A.
Minimum Sheet Metal Gauges for Rectangular Duct for both galvanized steel and
stainless steel ducts shall be according to SMACNA HVAC Duct Construction
Standards, 3rd Edition - 2005.
Wherever the tables allow for more than one choice of gage and reinforcement, the
Contractor shall select the gage reinforcement and reinforcement spacing that will
be used throughout the Contract and submit this information to the Engineer through
the submittal process specified in the General Conditions.
END OF SECTION
13089K
