SECTION 23 35 33
ECOLOGY UNIT
INDEX
PART 1 - GENERAL
2
1.1
RELATED DOCUMENTS
2
1.2
SUMMARY
2
1.3
REFERENCES
2
1.4
PERFORMANCE REQUIREMENTS
2
1.5
ARRANGEMENT
2
1.6
SUBMITTALS
3
1.7
QUALITY ASSURANCE
3
1.8
DELIVERY, STORAGE, AND HANDLING
4
1.9
COORDINATION
4
1.10
EXTRA MATERIALS
4
PART 2 - PRODUCTS
4
2.1
GENERAL
4
2.2
UNIT CONSTRUCTION
5
2.3
VIBRATION ISOLATION
5
2.4
FILTER SECTION
5
2.5
FAN & FAN MOTOR
7
2.6
CONTROL PANEL
8
2.7
INSPECTION AND ACCESS PANELS AND ACCESS DOORS
8
2.8
OTHER COMPONENTS
9
2.9
SAFETY FEATURES
10
PART 3 - EXECUTION
10
3.1
EXAMINATION
10
3.2
INSTALLATION
10
3.3
FIELD QUALITY CONTROL
10
3.4
STARTUP SERVICE
11
3.5
ADJUSTING
11
3.6
CLEANING
11
3.7
DEMONSTRATION
12
Section 23 35 33
ECOLOGY UNIT
Page 1 of 12
Rev. 01 - Sep 2022
Issued for Construction
PART 1 - GENERAL
1.1
RELATED DOCUMENTS
A.
1.2
Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 01 Specification Sections, apply to this Section.
SUMMARY
A.
1.3
This Section includes the following:
1.
Centrifugal fans.
2.
Activated Carbon Filters
3.
Panel Filters
4.
Bag Filters.
5.
Electrostatic Precipitator with Manual Wash
REFERENCES
A.
The ESP shall be rated to ETL/UL – 867 testing standards.
B.
ASHRAE / CE Compliance: Products shall comply with performance requirements
C.
Electrical Components, Devices, and Accessories: Listed and labelled as defined in IEC /
NFPA 70, by a qualified testing agency, and marked for intended location and application.
D.
Comply with requirements of local authorities having jurisdiction.
1.4
PERFORMANCE REQUIREMENTS
A.
Project Altitude: Base fan performance ratings on actual Project site elevations above sea
level.
B.
Operating Limits: Classify according to AMCA 99.
C.
Delegated Design: Design vibration isolation and seismic-restraint details, including
comprehensive engineering analysis by a qualified professional engineer, using
performance requirements and design criteria indicated.
D.
Structural Performance: Casing panels shall be self-supporting and capable of withstanding
133 percent of internal static pressures indicated, without panel joints exceeding a deflection
of L/200 where "L" is the unsupported span length within completed casings.
E.
Seismic Performance: Ecology units shall withstand the effects of earthquake motions
determined according to ASCE/SEI 7.
F.
The term "withstand" means "the unit will remain in place without separation of any parts
from the device when subjected to the seismic forces specified and the unit will be fully
operational after the seismic event."
1.5
ARRANGEMENT
A.
The ecology unit shall be horizontal draw-thru unit containing Filter Module (Panel and Bag
Filters), ESP module with manual wish, Odour Control Module (Activated Carbon Filters),
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Issued for Construction
Fan Module, Control Panel and VFD as defined on the design drawings and equipment
schedule.
B.
Ecology Unit installed at exposed areas direct to sun shall be with factory supplied/site
fabricated protective canopy.
C.
System mounting to be designed for Interior/Exterior, Suspended/Floor/Roof.
1.6
SUBMITTALS
A.
Product Data: Include rated capacities, furnished specialties, and accessories for each type
of product indicated and include the following:
1.
2.
3.
4.
5.
6.
7.
8.
Certified fan performance curves with system operating conditions indicated.
Certified fan sound-power ratings.
Fan construction and accessories
Motor ratings and electrical characteristics, plus motor and electrical accessories.
Material thickness and finishes, including colour charts.
Dampers, including housings, linkages, and operators.
Electrical connections and characteristics of the Electrostatic Precipitator
Filters with performance characteristics
B.
Confirmation that separation distances between outdoor air intakes and any exhausts or
discharge points comply with ASHRAE 62.1 or local code whichever is more stringent.
C.
Vibration Isolation Base Details: Detail fabrication including anchorages and attachments to
structure and to supported equipment. Include adjustable motor bases, rails, and frames for
equipment mounting. Calculate requirements for selecting vibration isolators and seismic
restraints and for designing vibration isolation bases.
D.
Shop Drawings: Detail equipment assemblies and indicate dimensions, weights, loads,
required clearances, method of field assembly, components, and location and size of each
field connection.
1.
2.
3.
Wiring Diagrams: Power, signal, and control wiring.
Design Calculations: Calculate requirements for selecting vibration isolators and
seismic restraints and for designing vibration isolation bases.
Vibration Isolation Base Details: Detail fabrication, including anchorages and
attachments to structure and to supported equipment. Include auxiliary motor slides
and rails, and base weights.
E.
Coordination Drawings: Show fan room layout and relationships between components and
adjacent structural and mechanical elements. Show support locations, type of support, and
weight on each support. Indicate and certify field measurements.
F.
Field quality-control test reports.
G.
Operation and Maintenance Data: For centrifugal fans to include in emergency, operation,
and maintenance manuals.
1.7
QUALITY ASSURANCE
A.
Electrical Components, Devices, and Accessories: Listed and labelled as defined in
NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and
marked for intended use.
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B.
The ESP shall be rated to ETL/UL – 867 testing standards.
C.
ASHRAE compliance: Applicable requirements in ASHRAE 62.1, Section 5 - "Systems and
Equipment" and Section 7 - "Construction and Start-up."
D.
AMCA Compliance: Products shall comply with performance requirements and shall be
licensed to use the AMCA-Certified Ratings Seal.
E.
IEC Compliance: Motors and electrical accessories shall comply with IEC.
F.
The equipment manufacturer shall strictly comply and produce certifications to the following
Management Systems:
1.8
1.
ISO 9001:2015 – Certification for Quality Management Systems
2.
ISO 14001:2015 – Certification for Environmental Management Systems
3.
ISO 45001:2018 – Certification for Occupational Health and Safety
DELIVERY, STORAGE, AND HANDLING
A.
Deliver unit as factory-assembled units, to the extent allowable by shipping limitations, with
protective crating and covering.
B.
Disassemble and reassemble units, as required for moving to the final location, according to
manufacturer's written instructions.
C.
Lift and support units with manufacturer's designated lifting or supporting points.
1.9
COORDINATION
A.
Coordinate size and location of structural-steel support members.
B.
Coordinate size and location of concrete bases. Cast anchor-bolt inserts into bases.
Concrete, reinforcement, and formwork requirements are specified in Division 03.
C.
Coordinate installation of roof curbs, equipment supports, and roof penetrations. These
items are specified in Division 07 Section "Roof Accessories."
1.10
A.
EXTRA MATERIALS
Furnish extra materials described below that match products installed and that are
packaged with protective covering for storage and identified with labels describing contents.
1.
Belts: One set for each belt-driven unit.
PART 2 - PRODUCTS
2.1
GENERAL
A.
Supply and install as indicated in the schedule of equipment, Ecology Units, each capable of
the duty as mentioned in the schedule of equipment. The space available for the unit to be
physically verified at the site and dimensions of the units shall be selected to fit into the
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spaces available. Where necessary the units may be built on site, subject to acceptance of
the finished units for warranty purposes by the original supplier and their local agent.
B.
The units shall be double skin construction, draw-thru type comprising of various filtration
components to address grease, oil, particulate, smoke and odour along with fan section as
per the details shown either in the drawings or specified in the schedule of equipment.
C.
The proposed specification of Ecology Units is suitable for installations having single pass
Electrostatic Precipitators (for medium cooking) and double pass Electrostatic precipitator
(for heavy cooking) located close to the kitchen hood. Electrostatic Precipitators shall
address heavy grease, oil and smoke. Ecology Units shall work in conjunction with
Electrostatic Precipitators to address the residual particulate and odour. ESP should be of
ETL or UL listed.
2.2
UNIT CONSTRUCTION
A.
The unit casings shall be of double skinned panels not less than 50mm thickness. Casing
shall be assembled with extruded aluminium profiles and self-supporting modular panel
elements with an integrated base frame made of zincated steel sections along upper sides
of the units.
B.
Sheet metal thickness shall be not less than 1.0 mm for the inner skin, 1.0 mm for the outer
skin and shall be made from 270 GSM zincated steel sheets. The outer skin shall be prepainted galvanized steel sheet having 7 to 9 microns of primer coat and 20 to 25 microns of
polyester coat on the outer surface. For additional protection, outer surface of the outer skin
shall be provided with vinyl guard film for scratch protection. Inside and outside of panel
walls shall be completely smooth.
C.
All casing panels shall be insulated with injected CFC free polyurethane foam insulation and
shall be in accordance to Class O of ISO 1182.2 standards. The insulation density shall be
48 Kg /m3 and having thermal conductivity (K value) of 0.02 W/m K.
D.
The base frame of the units shall be made from sendzimir galvanized sheet metal for size
with largest dimensions upto 2500 mm, and hot dip galvanized U-profile for larger units.
Units installed outdoors shall be fitted with weather proof aluminium canopy.
2.3
VIBRATION ISOLATION
A.
2.4
The Ecology Unit shall have internal vibration isolation system by mounting fan, motor and
drive assembly on spring isolators designed for 93% isolation. The fan discharge shall be
connected to the Ecology Unit casing through canvas connection to prevent vibration
transfer. In addition to the above the entire unit shall be mounted on additional vibration
isolators.
FILTER SECTION
A.
Filter cells shall be of standard sizes & shall be obtained from reputed American / European
manufacturer. The filters shall be sealed against the filter frame using a permanently elastic
gasket to a standard compatible with the filter efficiency.
B.
Pressure drop tappings shall be integrated into the frame to allow a manometer or filter
monitor to be fitted. Filter materials shall be flame-retardant, non-odorous & offer no
sustenance to vermin. Each filter section to be provided with manometer.
C.
The filter material shall be pleated to provide a large effective area. Filter section should be
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provided with an access door.
D.
Stage 1 Filtration:
1.
2.
3.
4.
E.
Stage 2 Filtration:
1.
2.
3.
4.
F.
Washable Type Metallic Filter in 4” thickness, Class G2.
Metallic washable filters shall be made of fine galvanized steel wire mesh for use in
heavy duty industrial and kitchen air ventilation applications. To have excellent dust
holding capacity and ability to perform in high moisture conditions especially suitable
for use as grease filters in kitchen hoods. The Metallic filters shall be with multiple
layered pleated galvanized steel wire mesh formed into compact maze of dirt
catching surfaces.
The multi layered media to be held in place by metal grids on both the inlet and outlet
side of the filter thus increasing its rigidity and ensures filter performance in heavy
dust loading conditions. The filters shall be washed in a solution of detergent and
warm water or cleaned with compressed air.
Technical Specifications of Panel Pre Filters :
a.
Filter class: G2/G3 as per EN 779 Standard.
b.
Initial resistance: 30-35Pa
c.
Final recommended resistance: 175-200 pa for washing.
d.
Rated velocity: 2.5 m/s
e.
Average Arrestance: 75-80%
f.
Maximum operating temp: 300 Deg C.
Disposable Type Panel Filters, Pleated in 4” thickness, Class G4.
The 4” depth pleat shall have consistent pleat spacing and durable execution. Pleated
Filters feature a self-supporting media pack in a two-piece frame, pleat stabilizers on
the air leaving side in combination with pleat support straps on the air entering side
ensure pleat consistency providing excellent dust holding capacity and low-pressure
resistance. The media pack shall be housed inside a two-piece frame and bonded
with a water-resistant sealant to create a filter with excellent rigidity and durability.
The pleat media shall be made from a controlled and repeatable special blend of size
specific virgin fibres. The fibre technology shall give the media its self-supporting
durable built in memory feature which eliminates the need for wire mesh supports.
Technical Specifications of Panel Filters:
a.
Filter class: G4 as per EN 779 Standard.
b.
Initial resistance: 45-50Pa
c.
Final recommended resistance: 250 pa
d.
Rated velocity: 2.5 m/s
e.
Average Arrestance: ≤90%
f.
UL Certified
g.
Maximum operating temp: 70 Deg C.
Stage 3 Filtration:
1.
2.
3.
4.
Section 23 35 33
Disposable type Pocket Filters, Class F7
Pocket filters shall be made of ultra-fine synthetic fibre media consisting of a unique
blend of coarse and fine synthetic fibre specially designed and Interwoven to provide
a low initial resistance and high air cleaning performance. The coarse fibre arrest and
larger and heavier particles in the air stream while the fine fibre remove the smaller
particulate matter and give the filter its high efficiency classification.
The fine pocket filters shall be assembled in 1.5mm thick galvanized steel frames and
mechanical robust and offering excellent performance in high relative humidity
conditions. The media is colour coded for identification as per Filter class.
Technical Specifications of Pocket Filters:
a.
Filter class: F7 as per EN 779 Standard
b.
Rated velocity: 2.5 m/s
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c.
d.
e.
f.
G.
Stage 4 Final Filtration & Odour Removal:
1.
2.
3.
4.
2.5
Average Arrestance: 98%
Efficiency: 80-85%.
UL Certified
Maximum operating temp: 70 Deg C.
Activated carbon Filters, Refillable type canister type.
Canister delivery system shall consist of multiple individual canisters in metal
execution. Canister shall be assembled in a galvanized sheet metal holding frame to
fit standard dimension filter sections in Ecology units. Canisters come as factory –
ready for installation. No special tools are needed to replace a canister. The individual
canisters seals and holds in the frame due to its unique seal and bayonet style
clamping mechanism.
Canisters shall be factory pre-Filled with user specific media, each canister shall be
vibration filled in order to ensure that the media is uniformly packed, each canister
shall be then plastic bagged, and carton packed.
Technical specifications:
a.
Frame material: Galvanized steel frame
b.
Carbon Filter size: 145 dia. x 600 mm long
c.
Volume per canister: 5.9 l
d.
Capacity per 24x24: 3200 m3/hr having 16 canisters
e.
Carbon content: 3 kgs per canister= 48 kgs per cell size 24x24.
f.
Pressure drop: 150 Pa
g.
Dwell time (contact time): 0.1 sec
h.
Refillable type: Yes
i.
UL Certified.
FAN & FAN MOTOR
A.
Fans shall be double inlet, double width, and backward curved centrifugal type with
galvanized steel casings. Fans shall be tested in accordance with AMCA 300-85. Every
individual fan shall be run before Delivery to check bearing condition and vibration. Fan
shafts shall be mounted in taper sleeve bearings designed for continuous operation and a
mean useful life of 200,000 hours. Backward curved impeller should be coated with 60
micron epoxy painting of high quality.
B.
Fans shall be designed in accordance with the specified operating class of AMCA standard
99-2408-69 – performance class limits for centrifugal fans. The impeller & fan shaft shall be
statically and dynamically balanced to a balancing grade of G 2.5. The fan shall be
connected to the outlet opening by means of an airtight flexible connection. Fans shall not
exceed a maximum outlet velocity of 12 m/sec.
C.
The fan outlet shall be connected to casing with the help of fire-retardant fabric acting as a
flexible connection for anti-vibration tested to UL-214 and confirms to NFPA 90A & NFPA
90B standards.
D.
The degree of protection shall be IP55 with mounting method B3 and Class F insulation for
the electric motors. Fan drive shall be rated at 150% of the maximum motor power of the
units and shall be fitted with adjustable belt tension arrangement. Belt guards or screen
protection door in fan section shall be provided in accordance with CEN Standard.
E.
The electrical characteristics of the fan motor shall meet the requirements of the local
regulatory authorities. The fan motor shall be wired to the safety isolation switch or
connection box. The contractor shall select power input and speed of the fan subsequent to
ascertaining system static pressure in accordance with pressure drop calculations to the
approval of the engineer.
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F.
The fan motor shall meet the safety requirements of the CE and compatible with variable
frequency drives. The motor shall be mounted on a common, torsionally rigid, galvanized
steel base frame.
G.
The fan and motor shall be rated for continuous operation in a greasy air stream at 200oC.
2.6
CONTROL PANEL
A.
VFD built-in control panel provided with a selector switch for auto and manual model.
Control panels shall have four nos. of differential pressure switches to monitor the filter
status including a pressure transducer and a programmable logic (PLC) control.
B.
Filter status to be indicated with lamps on the panel face. Pressure transducer will modulate
the fan speed as the filters starts to clog. If all the filters are clogged, regardless of
transducer status, the system need to shut off and unit off status indication to be display on
the panel.
C.
If the system shuts off due to clogged filter, the unit should be capable to override the auto
mode into manual mode through the selector switch provided on the panel face.
D.
In manual mode, the unit shall run on full speed until the filter are cleaned / replaced and
then shift the selector switch to auto mode.
E.
Control circuits to operate of 24 VAC.
2.7
INSPECTION AND ACCESS PANELS AND ACCESS DOORS
A.
Panel and Door Fabrication: Formed and reinforced, single- or double-wall and insulated
panels of same materials and thicknesses as casing.
B.
Inspection and Access Panels:
1.
2.
3.
C.
Access Doors:
1.
2.
3.
D.
Fasteners: Two or more cam locks type for panel lift-out operation. Arrangement shall
allow panels to be opened against air-pressure differential.
Gasket: Neoprene, applied around entire perimeters of panel frames.
Size: Large enough to allow inspection and maintenance of ecology unit's internal
components.
Hinges: A minimum of two ball-bearing hinges or stainless-steel piano hinge and two
wedge-lever-type latches, operable from inside and outside. Arrange doors to be
opened against air-pressure differential.
Access Doors shall be full width and height of the unit for each section and shall be
secured with a minimum number of fastenings consistent with effective air sealing.
Gasket: Neoprene, applied around entire perimeters of panel frames.
Location and Applications
1.
2.
3.
Section 23 35 33
Fan Section: Doors
Filter Section: Access doors large enough to allow periodic removal and installation of
filters.
Service light: 60-W vapor proof fixture with switched junction box located inside
adjacent to door.
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2.8
OTHER COMPONENTS
A.
Each unit shall be designed and constructed for ease of handling and replacement or
addition of sections.
B.
Each section shall be of the same construction type and present a smooth internal
appearance to ensure even airflow through the components and prevent dirt build up.
C.
The cross section of the unit should be based on the plant room configuration proposed,
taking full account of maintenance access requirements.
D.
Fan section of ecology unit shall be provided with interior lighting. A micro switch shall be
provided in each door to operate the light, when the door is opened.
E.
All individual components and sections shall be assembled using proprietary and suitable
fastening techniques. Locking devices shall be used with all fastenings that are subject to
vibration.
F.
Galvanized steel bolts, screws and washers shall be used for the assembly of the units.
G.
Fabricate structural frame with members rigidly braced to hold all parts in line and to prevent
change in shape when operating.
H.
Unless otherwise specified, structural frame of welded construction shall be painted with two
coats of primer, followed by two coats of aluminum epoxy paint. Finish exterior surfaces with
factory applied enamel coating in addition to the standard shop applied paint.
I.
Airstream Surfaces: Surfaces in contact with the airstream shall comply with requirements in
ASHRAE 62.1.
J.
Frame members shall be mechanically fixed and sealed with fire retardant gaskets (Surface
spread of Flame Class 1 to BS 476 Part 7) to give the necessary structural strength and air
leakage integrity.
K.
All metal surfaces must be properly treated and painted in the manufacturer’s works as
standard provision.
L.
The casing panels shall be of rigid double-skinned modular construction, corrosion resistant
and structurally adequately to be free from distortion and drumming in operation.
M.
The insulation shall be injected between the outer and inner casing. Insulation shall have a
thermal conductivity no greater than 0.02 W/mK.
N.
Care shall be taken to ensure surface protection of internal insulation in areas where free
moisture may be present and to avoid damage in sections having walk-in access.
O.
Thermal insulation shall be selected and applied to prevent surface condensation at design
conditions and to maximize noise attenuation. Insulation for panels and all structural or
reinforced members shall be 50 mm thick.
P.
Lifting lugs or alternate safe handling arrangements shall be provided such that each unit
shall be capable of being lifted as both a complete assembly, and as sub sections to
facilitate handling and installation.
Q.
Hinged access doors with air seals shall be provided to facilitate access to all internal parts
such as filter, fan and bearings etc.
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R.
Floors at all accessible sections shall be designed for a 5 kPa loading.
S.
Ecology unit panels shall be protected by galvanizing for anti-corrosion protection or a
similar finish in the internal surfaces of the units liable to be affected by any moisture.
2.9
SAFETY FEATURES
A.
All the units must have safety features as under:
1.
The fan access door shall be equipped with micro-switch interlocked with fan motor to
enable switching off the fan motor automatically in the event of door opening.
2.
The fan access door shall be provided with a view port and further have wire mesh
screen as an added safety feature bolted on to the unit frame.
3.
Fan and motor base shall be properly earthed from the factory. All screws used for
panel fixing and projecting inside the unit shall be covered with PVC caps to avoid
human injury.
PART 3 - EXECUTION
3.1
EXAMINATION
A.
Examine areas and conditions, with Installer present, for compliance with requirements for
installation tolerances and other conditions affecting performance of the Work.
B.
Examine casing insulation materials and filter media before unit installation. Reject
insulation materials and filter media that are wet, moisture damaged, or mold damaged.
C.
Proceed with installation only after unsatisfactory conditions have been corrected.
3.2
INSTALLATION
A.
Equipment Mounting: Install units on concrete bases using restrained spring isolators.
Secure units to anchor bolts installed in concrete bases.
1.
Minimum Deflection: 25 mm.
B.
Suspended Units: Suspend and brace units from structural-steel support frame using
threaded steel rods and spring hangers. Comply with requirements for vibration isolation
devices specified in Division 23 Section "Vibration and Seismic Controls for HVAC Piping
and Equipment."
C.
Arrange installation of units to provide access space around units for service and
maintenance.
D.
Do not operate fan system until filters (temporary or permanent) are in place. Replace
temporary filters used during construction and testing, with new, clean filters.
E.
Install filter-guage, static-pressure taps upstream and downstream of filters. Mount filter
guages on outside of filter housing in accessible position. Provide filter guages on filter
banks, installed with separate static-pressure taps upstream and downstream of filters.
3.3
FIELD QUALITY CONTROL
A.
Manufacturer's Field Service: Engage a factory-authorized service representative to
inspect, test, and adjust components, assemblies, and equipment installations, including
connections.
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B.
Perform tests and inspections.
1.
Manufacturer's Field Service: Engage a factory-authorized service representative to
inspect components, assemblies, and equipment installations, including connections,
and to assist in testing.
C.
Tests and Inspections:
1.
Fan Operational Test: After electrical circuitry has been energized, start units to
confirm proper motor rotation and unit operation.
D.
All unit or components will be considered defective if unit or components do not pass tests
and inspections.
E.
Prepare test and inspection reports.
3.4
STARTUP SERVICE
A.
Engage a factory-authorized service representative to perform start-up service.
1.
2.
3.
4.
5.
6.
7.
8.
B.
Starting procedures for units include the following:
1.
2.
3.
3.5
Complete installation and start-up check according to manufacturer's written
instructions.
Verify that shipping, blocking, and bracing are removed.
Verify that unit is secure on mountings and supporting devices and that connection to
piping, ducts, and electrical systems are complete. Verify that proper thermaloverload protection is installed in motors, controllers, and switches.
Verify proper motor rotation direction, free fan wheel rotation, and smooth bearing
operations. Reconnect fan drive system, align belts, and install belt guards.
Verify that bearings, pulleys, belts, and other moving parts are lubricated with factoryrecommended lubricants.
Verify that zone dampers fully open and close for each zone.
Install new, clean filters.
Verify that manual and automatic volume control and fire and smoke dampers in
connected duct systems are in fully open position.
Energize motor; verify proper operation of motor, drive system, and fan wheel. Adjust
fan to indicated rpm. Replace fan and motor pulleys as required to achieve design
conditions.
Measure and record motor electrical values for voltage and amperage.
Manually operate dampers from fully closed to fully open position and record fan
performance.
ADJUSTING
A.
Adjust damper linkages for proper damper operation.
B.
Comply with requirements in Division 23 Section "Testing, Adjusting, and Balancing for
HVAC" for air-handling system testing, adjusting, and balancing.
3.6
CLEANING
A.
After completing system installation and testing, adjusting, and balancing air-handling unit
and air-distribution systems and after completing start-up service, clean air-handling units
internally to remove foreign material and construction dirt and dust. Clean fan wheels,
cabinets, dampers, coils, and filter housings, and install new, clean filters.
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3.7
DEMONSTRATION
A.
Engage a factory-authorized service representative to train. Employer sub-maintenance
personnel to adjust, operate, and maintain air-handling units.
END OF SECTION 23 35 33
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