substitution request - Alliance Construction Solutions

3.03 INSTALLATION OF AIR TERMINALS:
A. General: Install air terminals as indicated and in accordance with manufacturer's
installation instructions.
B. Location: Install each unit level and accurately in position indicated in relation to other
work; and maintain sufficient clearance for normal service and maintenance, but in no
case less than that recommended by manufacturer.
C. Duct Connections: Connect ductwork to air terminals in accordance with Division 23
ductwork sections.
1. Provide conical taps at medium-pressure branch duct takeoffs from main trunk
duct to terminal units.
2. Arrange medium-pressure branch ducts and takeoffs so that there are no more
than two elbows or bends up to 90 degrees in branch duct to terminal unit inlets;
“U” bends will not be allowed.
3. Inlet branch ducts greater than 20 feet in length shall be increased in size to one
full duct size larger than the terminal inlets to which they are connected. Locate
reducer 3 feet ahead of terminal inlet.
4. Inlet branch ducts shall have a minimum of 3 feet of straight duct ahead of the
unit inlet, including no reducers.
5. Medium-pressure flexible ductwork (with flexible aluminum core), when used, and
where allowed by local Code, shall be limited to a maximum of 6 feet per inlet.
6. Provide a minimum of 4 feet of lined low-pressure ductwork between the terminal
unit outlet and the first spin-in fitting or supply air outlet branch duct takeoff.
D. For fan-powered terminals, provide plenum air inlet sound attenuating boot, as indicated
on drawings, and flexible connector at unit outlet.
3.04 FIELD QUALITY CONTROL:
A. Upon completion of installation and prior to initial operation, test and demonstrate that air
terminals, and duct connections to air terminals, are leak-tight.
B. Repair or replace air terminals and duct connections as required to eliminate leaks, and
retest to demonstrate compliance.
3.05 CLEANING:
A. Clean exposed factory-finished surfaces. Repair any marred or scratched surfaces with
manufacturer’s touch-up paint.
3.06 BALANCING:
A. See Section 230593. Balancing contractor shall set all air quantity limits, and shall not
rely on any factory calibration. Report air quantity as measured by the air terminal’s
velocity pressure pickup, in addition to pitot traverses and outlet readings.
Project No.: 10145
550 15 th Street Dual Brand Hotel
03/16/2012
END OF SECTION 23 3600
23 3600 - 5 AIR TERMINAL UNITS