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15869-2
LOUVERS

PART 2 - PRODUCTS

2.1 MATERIALS
A. Exterior Stationary Louvers:

1. | Equal to Greenheck model EDJ-401.

2. Storm proof, .081 extruded aluminum 6063-T5 blades.

3. Architectural style.

4 6063-T5 extruded structural aluminum frame, 0.100" wall thickness, mitered
corners and caulking slots.

5. Rigid hidden architectural style mullions as required for span, but not greater
than 48" on center. Provide mullions at each section of louver requiring duct
or fan connection.

6. Blade stiffeners.

7. 1/2 inch mesh replaceable aluminum bird screen on interior, insect screen
where shown on the Drawings.
Kynar 500 finish - manufacturer's standard color selected by Engineer.
4 inch width.

0. Provide extended sill.
1. Caulk slots and flange when installed in masonry construction. Provide
nailing flange when installed in wood frame construction.

PART 3 - EXECUTION

3.1 INSTALLATION
A. Install as required using manufacturer's instructions and recommendations and as
shown on the Drawings.
B. Caulk all openings as required in Division 7 and as shown on the Drawings.
C. Isolate metal to metal contact between aluminum louver frames and steel damper
frames or ductwork with suitable paint.

3.2 CLEANING AND ADJUSTING
A. Clean all louvers and dampers of grease, tar and dirt to the satisfaction of the
Engineer.
B. Adjust all louvers to the satisfaction of the Engineer.

END OF SECTION

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15891-1

SECTION 15891

DUCT INSULATION

PART 1 - GENERAL

1.1 DESCRIPTION
A. Work Included: Provide and install all duct insulation as shown on the Drawings
and specified herein.
B. Related Work Specified Elsewhere: "HVAC - General" is specified in this Division.

12 QUALITY ASSURANCE
A. Fire Hazard Rating: When tested by ASTM E84 method flame spread rating shall
not exceed 25.
B. Acceptable Manufacturers:
1. Closed cellular flexible plastic:
a. Armacell "AP/ARMAFLEX",
b. Rubetex.
c. Or approved equal
2. Fiberglass:
a. Owens-Corning.

b. Knauf.
c. Certainteed.
d. Or approved equal.

PART 2 - PRODUCTS

2.1 MATERIALS
A. Duct insulation for wet area locations:
1. Wet areas
a. Grit Building
2. Closed cellular flexible plastic:
a. One inch thick
b. Thermal conductivity @ 75°F: 0.27/inch minimum
c. UL flame spread: 25 or less
d. Equal to Armacell AP/ARMAFLEX
B. Duct insulation for non-wet area locations.
1. Ductwork:
a. 1% inch thick fiberglass ductwrap
b. Factory applied reinforced aluminum or vinyl vapor barrier facing.
c. Thermal conductivity @ 75°F: .26/inch minimum
d. Equal to Owens-Corning series ED-100 FRK-25
2. Plenums and duct sections with one side 48" or larger:
a. 1% inch thick rigid industrial fiberglass insulating board
b. Factory applied reinforced aluminum or vinyl vapor barrier facing
c. Thermal conductivity @ 75°F: .24/inch minimum

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15891-2
DUCT INSULATION

d. Density: 3 lb/cu. ft.
e. Equal to Owen-Corming series 703 FRK-25

C. Exterior Duct Insulation

1. | Closed cellular flexible plastic
a. 2 inch thick
b. Thermal conductivity at @ 75°F: 0.25/inch minimum
c. ULL. flame spread: 25 or less
d. Finish: Armaflex WB finish with 10x10 Leno Weave glass mesh

PART 3 - EXECUTION

3.1

APPLICATION
A. Duct Insulation:

1. Required on all outside air intakes from exterior wall or roof to duct
termination including fan casing.

2. Required on all heated or cooled supply air ductwork from air handling unit to
duct termination including air handler if not factory insulated.

3. Required on exhaust ductwork from outside closure damper to exterior wall or
roof.

4. Insulate entire ducts and seal to prevent condensation on cold surfaces,
including standing seams, support straps, and other metal attached to the
ductwork.

5. Insulate access doors and gaskets to prevent metal to metal contact.

Apply insulation to clean, dry ductwork.

Remove damaged insulation and replace to the satisfaction of the Engineer at no

additional cost to the Owner.

Use sealing tapes 3 inches wide, reinforced, pressure sensitive type, SMACNA

approved. Tapes that do not adhere to insulation shall be cause for rejection of all

insulation work. Only apply tape when ambient temperature is between 40°F and
100°F.

Closed cellular plastic:

1. Obtain adhesive from the insulation manufacturer and apply to entire duct
surface, and all joints.

2. Apply in strict accordance with manufacturer’s instructions and
recommendations.

Fiberglass Ductwrap:

1. Apply insulation adhesive in 4" wide strips, 8" on center, circumferentially
around duct.

2. Tightly wrap insulation around duct with all joints butted and longitudinal
joint overlapped 2 inches.

3. On the bottom of ductwork over 24 inches wide, provide and install
mechanical fasteners at not more than 18" on center.

4. Tape all joints with 3" wide tape.

5. Tape over protruding stick pins.

Rigid Fiberglass Duct Board:

1. Impale insulation on welded pins or stick clips.

2. Install pins not more than 3" from edges, and 12" on center.

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3.
4.

15891-3
DUCT INSULATION

Seal all insulation edges and butt joints with 3" wide tape.
Seal all stick pin penetrations with round vapor barrier patches.

END OF SECTION

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15907-1

SECTION 15907

TESTING AND BALANCING HEATING AND VENTILATING SYSTEMS

PART 1 - GENERAL

1.1

DESCRIPTION

A.

Work Included: The testing and balancing Work includes the measurement and

setting of air and water flow devices in accordance with the Contract Documents for

the systems, recording data, making tests, and preparing reports, all as hereinafter
specified. Perform the Work specified in this Section on, and after the completion
of, Work on the HVAC systems.

Related Work Specified Elsewhere: "HVAC - General" is specified in this Division.

Qualifications: Obtain the services of a qualified testing organization, approved by

the Engineer, to perform the testing and balancing work as herein specified. The

criteria for determining qualifications of the testing organization shall be
certification by the Associated Air Balance Council (AABC), certification by the

National Environmental Balancing Bureau (NEBB), or organization shall have

submitted proof to satisfy the Engineer that the organization meets the technical

standards for membership of the AABC as published in the AABC "National

Standards for Field Measurements and Instrumentation - Total System Balance",

Volume Two, No. 12173, except that affiliation with manufacturers, installing

contractors, or engineering firms may not preclude their acceptance.

Procedures: Accomplish the Work in accordance with the Agenda specified herein.

Follow procedures described herein and, in general, if not specifically described

herein, the Work shall be in accordance with the Associated Air Balance Council's

"National Standards for Field Measurements and Instrumentation Total System

Balance", Volume Two, No. 12173, and standards of NEBB.

Cooperate with the selected test and balance agency in the following manner:

1. Provide sufficient time before final completion date so that tests and balancing
can be accomplished.

2. Provide immediate labor and tools to make corrections when required without
undue delay. Install balancing dampers as required by test and balance
agency.

3. Put all heating, ventilating and air conditioning systems and equipment into
full operation and continue the operation of same during each working day of
testing and balancing.

4. Keep the testing and balancing agency informed of any major changes made
to the system during construction, and provide with a complete set of as-built
drawings.

5. Include the costs of dampers, pulley and belt changes and the costs of
obtaining the test and balancing agency in the Contract price.

Installation shall not be considered complete until final reports by the testing agency

have been submitted to the Engineer and approved.

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15907-2
TESTING AND BALANCING HEATING AND VENTILATING SYSTEMS

1.2 SUBMITTALS TO THE ENGINEER

A.

B.

Submit the name of the proposed testing organization to the Engineer for approval
within 90 days after Contract award.
Provide all results of all required tests for the Engineer's approval.

1.3 AGENDA

A.

Preliminary Report: Review Drawings and Specifications prior to the installation of
any of the affected systems, and submit a written report to the Engineer indicating
any deficiencies in the system that would preclude the proper adjusting, balancing,
and testing of the systems.

Submit an agenda for approval by the Engineer prior to start of testing and

balancing work. The agenda shall include the following:

1. A complete listing of all air and water flow and air terminal measurements to
be performed.

2. Specific test procedures and parameters for determining specified quantities,
e.g., flow, drafts, etc., from the actual field measurements to establish
compliance with the Contract Documents.

3. Samples of forms showing applications of procedures and calculations to
typical systems.

Advise the Engineer in advance when the testing will begin so that the testing

procedure and techniques can be evaluated and approved or modified.

Procedure Reporting: Specific test procedures for measuring air quantities at

terminals shall specify type of instrument to be used, method of instrument

application (by sketch), and factors used.

PART 2 - PRODUCTS

2.1 MATERIALS

A.

Not applicable in this Section.

PART 3 - EXECUTION

3.1 PROCEDURES AND INSTRUMENTS - GENERAL

A.

B.

Requirements: Adjust all systems and components to perform as required by the
Drawings and Specifications.

Test Duration: Perform operating tests of heating coils, fans and other equipment
no less than a four-hour duration after stabilized operating conditions have been
established. Base capacities on temperatures and air and water quantities measured
during such tests.

Instrumentation: Use methods of application of instrumentation in accordance with
the approved agenda.

Use only instruments used for measurements that are accurate, and calibrated within
6 months of the testing with calibration histories for each instrument available for
examination. Have each test instrument calibrated by a laboratory approved by the
Engineer or by the manufacturer. The Engineer has the right to request instrument
recalibration, or the use of other instruments and test methodology, where accuracy
of readings is questionable.

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3.2

15907-3
TESTING AND BALANCING HEATING AND VENTILATING SYSTEMS

Apply all instruments in accordance with manufacturer's instructions and
recommendations.

Provide all labor, instruments and appliances required. Do not install instruments
that are permanent installations used for the tests, e.g., gages, thermometers, etc.,
until just prior to the tests to avoid damage and changes in calibration.

Accuracy of all thermometers shall be plus or minus | graduation at the temperatures
to be measured. Graduations shall conform to the following schedule.

Design Temperature Maximum
Medium Differential (°F) Graduation (°F)

Air 10 or less 1/2
Air over 10 l
Water 10 or less 1/10
Water 10-20 1/2
Water over 20 l

AIR SYSTEM PROCEDURES

A.

Adjustments: Adjust all air handling systems to provide the required design air
quantity to, or through, each component. Conduct adjustment and balancing of all
systems during the period of the year approximating maximum seasonal operation,
unless otherwise directed or approved by the Engineer.

Equalizers: Adjust equalizing devices to provide uniform velocity across the inlets
(duct side for supply) of terminals prior to measuring flow rates.

Balance: Use flow adjusting (volume control) devices to balance air quantities only,
i.e., proportion flow between various terminals comprising system, and only to the
extent that their adjustments do not create objectionable air motion or sound, i.e., in
excess of normal limits.

Accomplish balancing between runs (submains, branch mains and branches)
generally by flow regulating devices at, or in, the divided flow fitting.

Restriction imposed by flow regulating devices in or at terminals shall be minimal.
Make final measurements of air quantity after the air terminal has been adjusted to
provide the optimum air patterns of diffusion.

Fan Adjustment: Generally vary the total air system quantities, by adjusting fan
speeds, or axial-flow fan wheel blade pitch. Use damper restriction of a system's
total flow only for systems with direct connected fans (without adjustable pitch
blades), provided system pressure is less than 1/2 inch w.g.

Except as specified herein, make pitot tube traverses of each duct to measure air
flow therein. Pitot tubes, associated instruments, traverses, and techniques shall
conform to the ASHRAE Handbook of Fundamentals.

Omit pitot tubes traverse when the duct serves only a single room of space and its
design volume is less than 200 cfm. In lieu of Pitot tube traverse, determine air flow
in the duct by totaling volume of individual terminals served, measured as specified
herein.

Where duct's design velocity and air quantity are both less than 1000 (fpm/cfm),
determine air quantity by measurements at terminals served.

Test Holes: Provide test holes, in straight ducts, as far as possible downstream from

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3.3

3.4

3.5

oA

M.

15907-4
TESTING AND BALANCING HEATING AND VENTILATING SYSTEMS

elbows, bends, take-offs, and other turbulence generating devices, to optimize
reliability of flow measurements.

Air Terminal Balancing.

Air Motion: Air motion and distribution shall be as specified and as shown on
Drawings. In addition to air motion measurements, make smoke tests wherever
requested by the Engineer, to demonstrate the air distribution from air terminals, at
no additional cost to the Owner.

Changes in the specified agenda due to field conditions, will be considered for
approval by the Engineer.

WATER SYSTEM PROCEDURES

A. Adjustment: Adjust all heating, bypass, and transfer systems to provide the required
quantity to, or through each component.

B. Metering: Measure water quantities and pressures with calibrated meters.

C. Use venturi tubes, orifices, or other metering fittings installed in system and
pressure gages to measure water flow rates and balance the systems.

D. Adjust the systems to provide the approved pressure drops through the heat transfer
equipment (coils, converters, etc.) prior to the capacity testing.

E. Where flow metering fittings are not installed, determine flow balance by measuring
temperature differential across the heater transfer equipment.

F. Perform measurement of temperature differential with the air system, adjusted as
described herein, in operation.

G. Automatic Controls: Position automatic control valves for full flow through the
heat transfer equipment of the system during tests.

H. Flow: Adjust the flow through bypass circuits at three-way valves to balance that
through the supply circuit.

I. Distribution: Adjust distribution by balancing devices (cocks, valves, and fittings)
and automatic flow control valves as provided. Do not use service valves.

J. | Only record pressure differential where automatic flow control valves are utilized in
lieu of venturi tubes, provided the pressure is at least the minimum applicable to the
tag rating.

K. Special Procedures: Where available pump capacity (as designed) is less than total
flow requirements of individual heat transfer units of system served, full flow may
be simulated by the temporary restriction of flow to portions of the system; specific
procedures shall be delineated in the agenda.

TEST RECORDS

A. Submittal: Submit three (3) copies of the reports described herein, covering air and
water system performance, and air motion (fpm), to the Engineer prior to final tests
and inspection.

B. Instrument Records: Include types, serial numbers, and dates of calibration of all
instruments.

C. Reports: Identify conspicuous items not conforming to Contract requirements in the
reports.

AIR SYSTEM DATA

A. Report: Include in the certified report, for each air-handling system, the following

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15907-5
TESTING AND BALANCING HEATING AND VENTILATING SYSTEMS

data (as applicable):
1. Equipment (fan or factory fabricated station unit):
a. Installation Data:
i. Manufacturer and Model.
ii. Size.
iit. Arrangement, Discharge, and Class.
iv. Motor H.P., Voltage, Phase, Cycles and Full Load Amps.
v. _ Location and Local Identification Data.
b. Design Data: Data listed in schedules on the Drawings and in the
Specifications.
c. Fan Recorded (Test) Data:
i. C.F.M.: Discharge CFM and % of OA under minimum conditions.
ii. Static Pressure: S.P. total, S.P. suction and S.P. discharge.
iit. R.P.M.: Fan and motor.
iv. Motor Operating Amps.
v. Motor Operating B.H_P.
vi. Motor Sheave Size and Make.
vii. Fan Sheave Size and Make.
vili. Number of Belts Size and Make.
2. Duct Systems:
a. Duct Air Quantities (Maximum and Minimum) - Main, Submains,
Branches, Outdoor (Outside) Air, Total-Air, and Exhaust:
i. Duct size(s)
it. | Number of Pitot tube (Pressure) Measurements.
iit. Sum of Velocity Measurements (Note: Do not add pressure
measurements).
iv. Average Velocity.
v. Recorded (Test) C.F.M.
vi. Design C.F.M.
b. Individual Air Terminals:
i. Terminal Identification (Supply or Exhaust, Location and Number
designation).
ii. Type, Size, Manufacturer and Catalog Identification.
iit. Applicable Factor for Application, Velocity, Area, etc., and
Designated Area.
iv. Design and Recorded Velocities - F.P.M. (State "core", "inlet",
etc., as applicable). Record data for three readings and average.
v. Design and Recorded Quantities - C.F.M. Record data for three
readings and average.
vi. Deflector Vane or Diffusion Cone Settings.

3.6 WATER SYSTEM DATA
A. Report: Include in the certified report, for each water system, the following data:

1. Pumps:
a. Installation Data:
i. Manufacturer and Model.
ii. Size.

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THE CITY OF NASHUA

Economic Development

To: L. Wilshire, President
From: T. Cummings, Director
Ce: Members of the Board of Aldermen

Date: March 8, 2022

Re: Communication — Approval & Place on File a Contract for Professional Services related to
the Nashua Downtown Riverfront Project for Doty Landscaping

The Tax Increment Financing Development Program and Financing Plan adopted by the Board
through the passage of O-18 -006, states that the City Economic Development Director shall be
the Administrator of the District and shall have the power to, inter alia, “negotiate and sign,
upon the approval of the Board of Aldermen, any contracts relative to the design, engineering,
construction, or operations of any phase or component of the activities proposed under this
Plan.”

A copy of the Professional Engineering Services Contract related to the Nashua Downtown
Riverfront Implementation Project with Doty Landscaping, along with Exhibits outlining the
scope and basis for fees is attached. As shown the contract is the City’s standard Professional
Engineer services contract.

The attached is a multiyear contract ending 10-31-2023 for the landscaping and maintenance of
the Riverfront project. The total figure for this effort is $180,000.00. The source of funds is the
TIF account created to implement the downtown riverfront project.

Pursuant to NRO §5-91 relative to Contract Amendments and in conforming with the Tax
Increment Financing Development Program and Financing Plan, I am requesting the approval of
the Board of Aldermen for the award of the attached contract amendment of $180,000.00