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SECTION 15910
DUCT ACCESSORIES
PART I - GENERAL
1.01
WORK INCLUDED
A.
1.02
1.03
Types of ductwork accessories required for this project include the following:
1.
Turning Vanes
2.
Duct Hardware
3.
Duct Access Doors
4.
Flexible Connections
5.
Dampers
6.
Fire Dampers
7.
Fire/Smoke Dampers
8.
Air Outlets and Inlets
9.
Variable Volume Boxes
QUALITY ASSURANCE
A.
SMACNA Compliance: Comply with applicable portions of Sheet Metal and Air
Conditioning Contractor's National Association (SMACNA) HVAC Duct Construction
Standards (Metal and Flexible), latest edition, for all work in this section.
B.
ASHRAE Standards: Comply with American Society of Heating, Refrigerating, and Air
Conditioning Engineers, Inc. (ASHRAE) recommendations, latest edition, for all work in
this section.
C.
NFPA Compliance: Comply with ANSI/NFPA 90A, "Standard for the Installation of Air
Conditioning and Ventilating Systems," and ANSI/NFPA 90B, "Standard for the
Installation of Warm Air Heating and Air Conditioning Systems."
D.
UL Compliance: Construct, test, install and label fire dampers, smoke dampers,
combination fire smoke dampers, and fire doors, in accordance with Underwriters
Laboratories (UL) Standard 555 and 555S, "Fire Dampers and Ceiling Dampers,” latest
edition.
SUBMITTALS
A.
Product Data: Submit manufacturer's technical product data in accordance with
requirements of Specification Section 01330. Submit manufacturer's product data for
each type of ductwork accessory, including dimensions, capacities, and materials of
construction, and installation instructions.
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B.
Equipment Data and Operation and Maintenance Instructions: Submit in accordance
with Specification Sections 01780 and 15010 requirements.
PART II - PRODUCTS
2.01
2.02
TURNING VANES
A.
Fabricated Turning Vanes: Provide fabricated turning vanes and vane runners,
constructed in accordance with SMACNA "HVAC Duct Construction Standards," latest
edition. Vanes to be high efficiency profile of minimum 26 gauge hot-dipped galvanized
steel. Side rails minimum 24 gauge hot-dipped galvanized steel.
B.
Manufacturers: Aero Dyne HEP, Duro-Dyne Corporation, or equal.
DUCT HARDWARE
A.
B.
2.03
Provide duct hardware manufactured by one manufacturer for all items on project for the
following:
1.
Test Holes: Provide in ductwork at fan inlet and outlet and elsewhere as required
for duct test holes consisting of slot and cover for instrument tests.
2.
Quadrant Locks: Provide for each damper quadrant lock device on one end of
shaft and end-bearing plate on other end for damper lengths over 12”. Provide
extended quadrant locks and extended bearing plates for externally insulated
ductwork.
Manufacturers: Ventfabrics, Inc., Young Regulator Company, or equal.
DUCT ACCESS DOORS
A.
Provide airtight access doors in ducts and plenums for cleaning and repairs for volume
and fire dampers for control devices within such ductwork and where shown on the
Drawings.
B.
Access doors into 2” pressure class ductwork shall be made of No. 24 gauge galvanized
steel minimum, reinforced with angle iron stiffeners. Doors shall be hinged and provided
with latches and gasket around entire edge to provide an airtight fit. Reinforce openings
for doors with structural steel.
C.
Access doors into ductwork greater than 2” pressure class shall be made of No. 22
gauge galvanized steel, removable double skin. Doors 16” and under to have two (2)
locks. Doors over 16” to have four (4) locks.
D.
Exact location of each access door shall be determined prior to installation and such
information shall be submitted to University's Representative for review and approval.
E.
Provide access doors at each change in direction requiring turning vanes, at bottom of
risers, and every 50’ in horizontal runs.
F.
Manufacturers: Ruskin, Ductmate, Nailor or equal.
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G.
2.04
FLEXIBLE CONNECTIONS
A.
2.05
Coordinate ceiling and wall access door locations with Architectural. Access doors shall
be sized to suit equipment. Access doors in inaccessible ceilings and walls are required
to gain access to all dampers, terminal units, coils, filters, valves, air vents, control
devices, traps, cleanouts and other similar devices requiring periodic observation
adjustment, service or replacement.
Furnish and install flexible connections at following locations:
1.
Exhaust
2.
Duct connection of return fan
3.
Duct connection of exhaust fan
4.
Elsewhere as shown on Drawings
B.
Flexible connections shall be preassembled flexible connectors constructed of coated
glass fabric applied in accordance with manufacturer's recommendations. Width of
flexible connections shall be sufficient to allow minimum of 2” of free space between two
metal collars to be connected. Install sheet metal band completely around duct or fan
outlet, at end of flexible connection. Fasten with metal screws through band and coated
glass fabric. Space screws approximately 3” apart. Coated glass fabric shall be
Ventfabrics Ventglas with neoprene coating for use inside building, or equal, and Ventlon
with hypalon coating, or equal, when exposed to weather.
C.
Manufacturers: Ventfabrics, Inc., Duro-Dyne Corporation, or equal.
DAMPERS
A.
Manual Dampers: Provide dampers of single-blade type or multi-blade type constructed
in accordance with SMACNA, "HVAC Duct Construction Standards," latest edition.
Damper blades shall not exceed 6” in width, except that 8” wide damper may be used in
8” wide ducts.
1.
Where dampers are installed above non-accessible ceilings, and are not served
by access doors, provide extension rods and concealed ceiling mounted damper
regulators. Regulator shall be equal to Ventlok Model 666.
2.
Balancing dampers shall be installed in all branch ducts and elsewhere as
indicated on the drawings.
B.
Control Dampers: Refer to Division 15 Section "Temperature Control Systems" for
control dampers, not work of this section.
C.
Backdraft Dampers: Provide dampers with parallel blades, constructed of 16-ga.
aluminum; provide ½” diameter ball bearings, ½” diameter steel axles spaced on 9”
centers. Construct frame of 2” by ½” by ⅛” steel channel for face areas 25 sq. ft. and
under; 4” by 1-¼” by 16-ga. channel for face areas over 25 sq. ft. Provide galvanized
steel finish on frame with aluminum touch-up.
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2.06
D.
Smoke Control Dampers: Provide and install at locations shown on drawings. Each
smoke damper shall be classified as a UL555S Leakage Class 1 smoke damper. Smoke
dampers shall have the capacity to operate (to open and close) under HVAC system
operating conditions, with pressure up to 4” w.g. in closed position, and 2,000 fpm air
velocity in open position. Damper and actuator shall be supplied as a complete assembly.
Damper assembly shall be Ruskin Model SD37 or equal.
E.
Submit complete installation instructions for all types of damper to be used on this
project, as part of main submittal.
F.
Manufacturers: Ruskin Manufacturing Company, American Warming and Ventilating,
Inc., Arrow Louver and Damper Corporation, or equal.
FIRE DAMPERS
A.
B.
2.07
Fire Dampers: Fire dampers shall be of folding-curtain type conforming to NFPA 90A
and Underwriters Laboratories (UL) Standard 555 and 555S, "Fire Dampers and Ceiling
Dampers,” current edition, and the State Fire Marshall. Dampers shall be arranged to
close automatically upon operation of listed fusible link and shall be held tightly closed by
means of steel spring clip latch.
Fusible links shall have temperature rating
approximately 50ºF. above normal maximum operating temperature. Steel parts shall be
factory galvanized.
1.
Dampers shall be factory installed in integral sleeves.
2.
Sleeves shall be supported by mounting flanges.
Dampers shall be equal to the following Ruskin Manufacturing Company dampers:
1.
Vertical mounted: IBD or DIBD as appropriate for the fire rating and systems
conditions.
2.
Ceiling mounted: CFD and CFDR as appropriate for the fire rating and system
conditions.
COMBINATION FIRE/SMOKE DAMPERS
A.
Fire/smoke dampers shall be furnished and installed at locations shown on plans or as
described in the schedules. Dampers shall meet the requirements of NFPA90A, 92A and
92B and shall be classified for use for fire resistance ratings as indicated on the plans in
accordance with UL555. Dampers shall further be classified as Leakage Rated Dampers
for use in smoke control systems in accordance with the latest version of UL555S. The
leakage rating under UL555S shall be leakage class 1.
B.
Each combination fire/smoke damper shall be equipped with a “controlled closure” quick
detect heat-actuated release device. Fusible Link: Replaceable, 165ºF. Provide 212ºF
rated as required.
C.
Damper frame shall be a minimum 16 gage galvanized steel formed into structural hat
channel reinforced at corners.
D.
Roll-Formed Steel Blades: Interlocking 16-gauge galvanized steel, 5” minimum, 8”
maximum single blade width. Stiffen damper blades to provide stability under operating
conditions.
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E.
Blade and Jamb Seals: Flexible stainless steel compression type jamb seals. Silicone
coated fiberglass fabric blade seals mechanically locked into blade edge.
F.
Linkages: External only.
G.
Blade Axles: Galvanized steel. Extend axles full length of damper blades.
H.
Bearings: Stainless steel sleeve, pressed into frame.
I.
Mounting Sleeve: Factory-supplied caulked sleeve, minimum of 20-gauge galvanized
steel, length to suit wall or floor application.
J.
Damper Actuators: Provide a damper actuator factory-installed out of the air stream on
the factory sleeve. Damper actuators will meet requirements of UL 555S for application
on a smoke damper, and will be rated for operation at an elevated temperature of 250ºF.
1.
Damper actuators will be electric (120VAC) 2-position, spring return that closes
damper upon loss of power. The switching relay to operate damper actuators
from a fire alarm signal will be provided by under Division 16. Coordinate power
and signal requirements with Division 16.
2.
Damper actuators will be pneumatic 2-position which closes damper upon loss of
control air signal. Provide electric-pneumatic switches to operate damper
actuators from a fire alarm signal. Coordinate control air requirements with
Division 15 Section “Automatic Control System.” Coordinate power and signal
requirements with Division 16.
K.
Damper End Switches: Factory-supplied switch packages to remotely indicate damper
blade position. Coordinate power and signal requirements with Division 16. End switches
shall be separate device, not a combination damper motor/end switch.
L.
Dampers shall be equal to the following Ruskin, Inc.
1.
2.08
FSD60 or FSD37 as appropriate for the fire rating and systems conditions with
FSNF120 (-S) BELIMO actuator.
AIR OUTLETS AND INLETS
A.
Grilles, registers, and diffusers shall be selected and guaranteed to operate without
objectionable noise or draft.
B.
Furnish and install sponge rubber gaskets between grilles and grounds of finished
surfaces. Wood grounds will be furnished by others. Metal grounds shall be furnished by
this Contractor. Sidewall grilles and registers shall be provided with dull prime coat finish,
unless noted otherwise. All supply diffusers, registers, and grilles located at ceiling shall
have factory-applied, bone-white finish.
C.
Paint visible ductwork behind grilles, registers, and diffusers dull black.
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D.
Outlet/Inlet
1.
Ceiling Diffuser
a.
2.
Supply Register
a.
3.
Titus Model 30RL Registers (with OBD where indicated on schedule), or
equal, no known equal. Provide full 24 X 24 ceiling plates at T-Bar
ceilings, with frame style to suit T-Bar style.
Extractor
a.
2.09
Linear supply diffuser with Border Type 2A and Model MLR Linear
Return with Border Type 9A, or equal. Provide Supply/Return mitered
end caps, (linear) alignment strips, insulated supply plenums, slot width
and number of slots as noted on Drawings.
Exhaust/Return
a.
6.
Titus Model MPI, or equal.
Supply/Return
a.
5.
Titus Model 272 RL (Wall) airfoil blade (with OBD where indicated on
schedule), or equal.
Continuous Linear
a.
4.
Titus Model MCD (with OBD where indicated on schedule) and throw
reducing vanes, or equal. Provide frame style 1 for gypboard ceiling.
Provide full 24 X 24 ceiling plates at T-bar ceilings, with frame style 3 to
suit T-bar style.
Titus Model AG-45 with gear operator, or equal.
E.
General: Except as otherwise indicated, provide manufacturer's standard ceiling air
diffusers where shown of size, shape, capacity, and type indicated; constructed of
materials and components as indicated and as required for complete installation. Provide
diffusers with border styles that are compatible with adjacent ceiling systems and that are
specifically manufactured to fit into ceiling module with accurate fit and adequate support.
Refer to general construction Drawings and specifications for types of ceiling systems,
which will contain each type of ceiling air diffuser.
F.
Manufacturers: Titus, Krueger, or equal.
VARIABLE VOLUME BOXES
A.
Furnish and install single duct, variable volume terminals of the sizes and capacities
noted on the Drawings.
B.
The terminals shall have pressure independent digital controls and shall be reset for
airflow between zero and maximum cataloged cfm. Airflow limiters will not be accepted.
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2.10
C.
NC levels to be less than or equal to scheduled levels. Furnish sound data for both
casing radiated and discharge sound levels for second through seventh octave bands as
tested in accordance with ADC standards.
D.
Static pressure drop shall not exceed scheduled values.
E.
Terminals must be certified under the ARI Standard 880-89 Certification Program and
carry the ARI seal. If the contractor wishes to submit a terminal which is not certified with
ARI, the terminal must be tested at an independent testing laboratory under conditions
selected by the University’s Representative in full compliance with the testing methods
defined by ARI Standard 880-89. Tests shall be witnessed by the University’s
Representative with all costs and expenses borne by the contractor. Testing does not
ensure acceptance.
F.
The terminal shall contain a multi-point, center averaging, amplifying velocity sensor.
The measuring ports must be parallel to the take-off from the sensor.
G.
All pneumatic tubing shall be UL listed, fire retardant (FR) type and of type specified in
Section 15960, BACS.
H.
The digital controller shall be factory mounted in a metal panel attached to the side of
each terminal box.
I.
The terminal casing shall not be less than 22 gauge galvanized steel with Fibre-Free
lining (Steri-Loc for OSHPD applications), no fiberglass internal lining. The casing shall
be sealed to hold leakage to 1% at 1-½” w.g.
J.
The damper shall be heavy gauge metal, with its shaft rotating in Delrin self-lubricating
bearings. The shaft shall be marked on the end to indicate the damper blade position.
The terminal shall be designed for field conversion from normally closed to normally
open.
K.
The damper shall have a built-in stop to prevent over stroking and shall seal against a
closed-cell foam gasket, to limit close-off leakage to the maximum of 2% at 6" w.g.
L.
Units to be equipped with integral attenuator and hot water coil where specified.
Manufacturers: Titus, Krueger, or equal.
DUCTWORK IDENTIFICATION
A.
Ductwork identification shall consist of stencil-painted identification on ductwork housing
of the air handling systems; including arrows to show flow, systems numbers and generic
name of service. Mark primary runs at housing and main branches, and mark access
doors to indicate equipment in housing or duct. Mark ductwork at 20' intervals. Where
concealed behind removable ceilings, markings may be plasticized tags in lieu of stencilpainted markers.
1.
Provide bakelite tags at areas where valves (equipment) are concealed above
ceiling or behind access doors. Tags to describe concealed valves (equipment)
color code for identification for plumbing shall be blue/HVAC-yellow/Electricalgreen/Fire-red.
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PART III - EXECUTION
3.01
3.02
3.03
INSTALLATION OF DUCT ACCESSORIES
A.
Install duct accessories in accordance with manufacturer's installation instructions with
applicable portions of details of construction as shown in SMACNA standards and in
accordance with recognized industry practices to ensure that products serve intended
function.
B.
Install turning vanes in square or rectangular 90º elbows in supply and exhaust air
systems and elsewhere as indicated.
C.
Install access doors to open against system air pressure, with latches operable from
either side, except outside only where duct is too small for person to enter.
D.
Coordinate with other work as necessary to interface installation of duct accessories
properly with other work.
E.
Field Quality Control: Operate installed duct accessories to demonstrate compliance with
requirements. Test for air leakage while system is operating. Repair or replace faulty
accessories as required to obtain proper operation and leak proof performance.
INSTALLATION OF AIR OUTLETS AND INLETS
A.
Install outlets and inlets in accordance with manufacturer's written instructions and in
accordance with recognized industry practices to ensure that products serve intended
functions.
B.
Locate ceiling air diffusers, registers, and grilles as indicated on general construction
"Reflected Ceiling Plans." Unless otherwise indicated, locate units in center of acoustical
ceiling modules.
C.
Examine areas and conditions under which outlets and inlets are to be installed. Do not
proceed with work until unsatisfactory conditions have been corrected.
D.
Ceiling-mounted air terminals or services shall be positively attached to the ceiling
suspension main runners or to cross runners with the same carrying capacity as the main
runners.
1.
Terminals or services weighing not more than 56 pounds shall have two No. 12
gauge hangers connected from the terminal or service to the structure above.
These wires may be slack.
2.
Terminals or services weighing more than 56 pounds shall be supported directly
from the structure above by approved hangers.
CARE AND CLEANING
A.
Repair or replace broken, damaged, or otherwise defective parts, materials, and work.
Leave entire work in condition satisfactory to University's Representative. At completion,
carefully clean and adjust equipment, fixtures, and trim installed as part of this work.
Leave systems and equipment in satisfactory operating condition.
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3.04
INSPECTION OF FIRE DAMPERS
A.
3.05
OPERATION TEST
A.
3.06
Fire/Damper and Smoke/Damper annular space shall be inspected prior to angles being
installed. All fire dampers shall be tested by the contractor and again in the presence of
the University Fire Department and the California State Fire Marshal. Provide spare
fusible links as required to complete testing to the complete satisfaction of the local fire
department.
Test each piece of equipment to show that it will operate in accordance with indicated
requirements.
1.
Any leaks found must be properly repaired, or joints remade and the section
retested until tight. Any leaks which cause an objectionable noise in excess of
40 db must be repaired, regardless of the amount of the leakage. Any diffuser
installation which causes an objectionable noise in excess of specified below
must be corrected: Patient Rooms - 35 db; Office and Exam rooms - 40 db;
Corridors and Waiting Rooms - 40 db.
2.
The leakage shall not exceed 1% of the designed flow, with a maximum
allowable in any case, of 50 CFM. No less than 50' of duct measured along the
main shall be tested at one time. All branches shall be tested at same time as
the main.
CLEANING UP
A.
Upon completion of Work remove materials, equipment, apparatus, tools, and the like,
and leave premises clean, neat, and orderly.
END OF SECTION 15910
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