USACE / NAVFAC / AFCESA / NASA UFGS-23 82 23 (November 2008)
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Preparing Activity: NASA Superseding
UFGS-23 82 23 (August 2008)
UFGS-23 82 23.00 40 (July 2007)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 23 82 23
UNIT VENTILATORS
11/08
NOTE: This specification covers the requirements for unit heaters and ventilators
.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome. Direct them
to the technical proponent of the specification. A listing of technical proponents
, including their organization designation and telephone number, is on the Internet.
Submit recommended changes to a UFGS as a Criteria Change Request (CCR).
PART 1 GENERAL
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text are automatically deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
[ACOUSTICAL SOCIETY OF AMERICA (ASA)ASA S12.11/Part 1(2003; R 2008) Acoustics-Measurement of Noise and Vibration of Small Air-Moving Devices, Part 1: Airborne Noise EmissionASA S12.11/Part 2(2003; R 2008) Acoustics-Measurement of Noise and Vibration of Small Air-Moving Devices, Part 2: Structure-borne VibrationASA S12.30(1990; R 2002) Standard Guidelines for the Use of Sound Power Standards and for the Preparation of Noise Test CodesASA S12.53/1(1999; R 2004) Acoustics- Determination of Sound Power Levels of Noise Sources - Engineering Methods for Small, Movable Sources in Reverberant Fields - Part1: Comparison Method for Hard-Walled Test RoomsASA S12.53/2(1999; R 2004) Acoustics- Determination of Sound Power Levels of Noise Sources Using Sound Pressure - Engineering Methods for Small, Movable Sources in Reverberant Fields - Part2: Methods for Special Reverberation Test Rooms][ALUMINUM ASSOCIATION (AA)AA DAF-45(2003) Designation System for Aluminum Finishes][ASTM INTERNATIONAL (ASTM)ASTM A 568/A 568M(2007a) Standard Specifications for Steel, Sheet, Carbon, and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements forASTM A 653/A 653M(2008) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip ProcessASTM F 1040(1987; R 2007) Standard Specification for Filter Units, Air Conditioning, Viscous - Impingement and Dry Types, Replaceable][CANADIAN STANDARDS ASSOCIATION (CSA)CSA 2.6(2006) Gas Unit Heater and Gas-Fired Duct Furnaces][INTERNATIONAL CODE COUNCIL (ICC)ICC IFGC(2006; Supplement 2007) International Fuel Gas CodeICC IMC(2006; Supplement 2007) International Mechanical Code][NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NEMA MG 1(2007; Errata 2008) Standard for Motors and Generators][NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 54(2008) National Fuel Gas CodeNFPA 70(2007; AMD 1 2008) National Electrical Code - 2008 EditionNFPA 90A(2008) Standard for the Installation of Air Conditioning and Ventilating Systems][U.S. DEPARTMENT OF DEFENSE (DOD)DOD-G-24508(1998d) Grease, High Performance, Multipurpose (Metric)]1.2 SUBMITTALS
NOTE: Review Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Keep submittals to the minimum required for adequate quality control.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, use a code of
up to three characters within the submittal tags following the "G" designation
to indicate the approving authority. Codes for Army projects using the Resident
Management System (RMS) are: "AE" for Architect-Engineer; "DO" for District
Office (Engineering Division or other organization in the District Office);
"AO" for Area Office; "RO" for Resident Office; and "PO" for Project Office.
Codes following the "G" typically are not used for Navy, Air Force, and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are [for Contractor Quality Control approval.][for information only. When used, a designation following the
"G" designation identifies the office that reviews the submittal for the Government.] Submit the following in
accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-01 Preconstruction Submittals
Submit Material, Equipment, and Fixture List in accordance with paragraph entitled, "General
Requirements," of this section.
Listing of Product Installations
SD-02 Shop Drawings
Submit connection diagrams indicating the relations and connections of the following items.
Indicate the general physical layout of all controls, and internal tubing and wiring details
on the drawings.
Heat Exchangers
Burners
Fans
Motors
Controls
Vertical Discharge Units
Horizontal Discharge Units
Heating Element
Propellers
Fresh Air Intakes
Submit Control Diagrams in accordance with paragraph entitled, "General Requirements," of this
section.
Submit installation drawings for the following items in accordance with the paragraph entitled,
"Installation," of this section.
Submit Record Drawings for the following items providing current factual information including
deviations from, and amendments, to the drawings and concealed and visible changes in the work.
Gas Unit Heaters
Propeller Unit Heaters
Cabinet Unit Heaters
Unit Ventilators
SD-03 Product Data
Submit Equipment and performance data for the following items consisting of use life, system
functional flows, safety features, and mechanical automated details. Submit curves indicating
tested and certified equipment responses and performance characteristics.
Gas Unit Heaters
Propeller Unit Heaters
Cabinet Unit Heaters
Unit Ventilators
Submit Manufacturer's catalog data for the following items:
Casing
Heat Exchangers
Burners
Fans
Motors
Controls
Vertical Discharge Units
Horizontal Discharge Units
Heating Element
Propellers
Filters
Enclosures
Wall Sleeve
Fresh Air Intakes
Insulation
Spare Parts
Vibration Isolation
SD-04 Samples
Submit Manufacturer's standard color chart for the following items showing manufacturer's standard
color selections and finishes.
Gas Unit Heaters
Propeller Unit Heaters
Cabinet Unit Heaters
Unit Ventilators
SD-07 Certificates
Submit Records of Existing Conditions in accordance with paragraph entitled, "General Requirements,"
of this section.
Submit Listing of Product Installations in accordance with paragraph entitled, "Installation,"
of this section.
Submit Certificates for following items showing conformance with the referenced standards contained
in this section.
Heat Exchangers
Burners
Fans
Motors
Controls
Vertical Discharge Units
Horizontal Discharge Units
Heating Element
Propellers
Fresh Air Intakes
SD-10 Operation and Maintenance Data
Submit [6] [_____] copies of the Operation and Maintenance Manuals 30 calendar days prior to
testing the following systems:
Gas Unit Heaters
Propeller Unit Heaters
Cabinet Unit Heaters
Unit Ventilators
Update and resubmit data for final approval no later than 30 calendar days prior to contract
completion.
1.3 MECHANICAL PROVISIONS
NOTE: If Section 23 00 00 AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST
SYSTEMS is not included in the project specification, insert applicable requirements
therefrom and delete the following paragraph. If Section 23 05 48 VIBRATION
AND SEISMIC CONTROLS FOR HVAC PIPING AND EQUIPMENT is not included in the project
specification, insert applicable requirements therefrom and delete the second
paragraph.
[Section 23 00 00 AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEMS applies to work specified in this
section.]
Submit vibration isolation components
1.4 GENERAL REQUIREMENTS
Provide Control Diagrams that show physical and functional relationships of equipment. Provide electrical diagrams
that show size, type, and capacity of the systems. Submit pneumatic diagrams for air and gas systems.
Provide Material, Equipment, and Fixture List that includes manufacturer's style or catalog numbers, specification
and drawing reference numbers, warranty information, and fabrication site information.
Submit Records of Existing Conditions consisting of the results of survey of work area conditions and features
of existing structures and facilities within and adjacent to the jobsite. Commencement of work constitutes acceptance
of existing conditions.
Provide Listing of Product Installations that includes identification of at least 5 installed units, similar
to those proposed for work, that have been in successful service for a minimum period of 5 years. Provide list
that includes purchaser, address of installation, service organization, and date of installation.
PART 2 PRODUCTS
NOTE: When possible the use of sealed bearings is encouraged. One of the major
causes of bearing failures is overlubrication and lubrication contamination.
Using sealed bearings helps to eliminate this failure mode.
NOTE: Provide fan and motor balance that conforms to ISO Std. 1940/1 - (1986)
Balance Quality Requirements of Rigid Rotors - Determination of Permissible
Residual Unbalance unless otherwise noted. Provide motor vibration levels that
conform to NEMA Specification MG-1, Motors and Generators, Part 7 unless otherwise
noted.
2.1 MANUFACTURED UNITS
Submit Spare parts list and information meeting referenced standards within this section.
2.1.1 Gas Unit Heaters (GUH)
Provide drawings or schedule that include capacity, gas data and mounting height.
2.1.1.1 Type
Provide suspended type unit heaters, arranged for discharge of air as indicated. Provide unit that complies
with CSA 2.6 and NEMA MG 1.
2.1.1.2 Casing
Provide casing that is manufactured of not less than 1.0 millimeter 20-gage steel. Provide casing with a phosphate
pretreatment, primer, and baked enamel finish inside and outside. Provide horizontal [adjustable] [non-adjustable]
louvers, completely recessed inside the casing frame.
[Provide [Four-way] [_____] deflection vanes.]
2.1.1.3 Heat Exchangers
Provide welded construction, heavy aluminized steel heat exchangers. Provide exchangers that are formed in a
clam-shell design to completely surround the burner. Provide individual combustion chambers for each burner.
2.1.1.4 Burners
Provide die-formed, aluminum-painted, heavy mild steel burners with long slot ports for even supply of gas.
Provide unitized construction burner assembly with integral crossover for positive burner ignition. Provide
a draft diverter as an integral part of each heat exchanger section to allow backdrafts to bypass burner assembly
without affecting normal operation.
2.1.1.5 Fans
Provide propeller type fans, designed and manufactured for unit heater application. Provide fans with a minimum
of three aluminum blades.
2.1.1.6 Motors
Provide motors that are totally enclosed, with built-in overload protection. Mount motors to back panel by a
fan guard motor mount constructed of spring steel wire.
2.1.1.7 Controls
Provide controls that include high limit switch, fan controls [including fan timer, lockout timer [_____]], a
24-volt automatic gas valve with 100 percent safety pilot shutoff, a pressure regulator with leak limiting device,
and manual main and pilot valves. Provide an integral junction box for all power and control connections.
[Provide a low voltage transformer.] [Provide a spark ignition controller.]
2.1.2 Propeller Unit Heaters-Hot Water and Steam (PUH)
Provide drawings or schedule that include capacity, heating media data and mounting height.
NOTE: This specification is applicable to both hot water and steam heating
medium.
2.1.2.1 Type
[Provide suspended type unit heaters, arranged for discharge of air as indicated.]
2.1.2.2 Vertical Discharge Units
[Provide vertical discharge units that operate at speeds not in excess of 1,200 revolutions per minute (rpm),
except that units with 14.6 kilowatt 50,000 British thermal units per hour output and less operate at speeds
up to 1,800 rpm. Cover discharge opening with a fan guard.]
NOTE: When one of the following paragraphs is selected, the mounting height
is affected.
[Provide louver cone diffusers.] [Provide adjustable vane diffuser.]
2.1.2.3 Horizontal Discharge Units
[Provide maximum volume in cubic meter per second (cms) feet per minute (cfm) and face velocity in meter second
(m/s) feet per minute (fpm) for horizontal discharge units as follows:
Volume Velocity
(cms) (m/s)
Up to 0.47 4.1
0.48 to 1.42 4.6
1.43 and over 5.1]
Volume Velocity
(cfm) (fpm)
Up to 1,000 800
1,001 to 3,000 900
3,001 and over 1,000
[Provide adjustable double deflection louvers.]
2.1.2.4 Heating Element
Provide manufacturer's standard construction heating elements, rated for [standard] [low output temperature]
service of not less than 149 degrees C at 517 kilopascal 300 degrees F at 75 pounds per square inch (psi).
2.1.2.5 Casings
Provide casings with smoothly contoured propeller orifice rings constructed of 1.0 millimeter 20-gage or thicker
cold-rolled carbon steel. Provide casing surface finish that includes phosphate pretreatment, prime coating,
and baked enamel finish.
2.1.2.6 Propellers and Motors
Provide propellers that have not less than four aluminum blades and are dynamically balanced.
[Provide horizontal-discharge units with fan inlet safety guard.]
[Mount motors on elastomer vibration isolators.]
2.1.2.7 Sound Rating
NOTE: Select the title and the following paragraph only if supplemented on
the drawings or herein by a sound rating in decibels.
[Test and sound rate unit heater in accordance with ASA S12.11/Part 1, ASA S12.11/Part 2, ASA S12.30, and ASA S12.53/1
and ASA S12.53/2.]
2.1.2.8 Control
[Control unit heaters [by line-voltage thermostats] [_____].]
2.1.3 Cabinet Unit Heaters (CUH)
Provide drawings or schedule that include capacity, power rating, heating media, filter, pressure drop, size,
and other pertinent data.
NOTE: This specification is applicable to both hot water and steam heating
medium.
2.1.3.1 Type
Provide quiet-operating type cabinet unit heaters, complete with heating elements, fans and drives, filters,
baffles and division walls, control provisions, and enclosures with access panels.
Provide cabinets that do not exceed drawing dimensions.
Rate unit pressure components for service at not less than 1050 kilopascal 150 psi at system working temperature.
2.1.3.2 Heating Element
Provide [manufacturer's standard aluminum fin] [serpentine copper-type tube] heating element that is drainable
and ventable.
Provide heating element with constant and permanent cataloged capacity.
Provide seamless deoxidized copper tube material.
Provide fins that are mechanically connected to the tubes. Regard loose fins at operating temperatures as causing
a reduction in capacity, requiring replacement of all such material at no additional cost to the Government.
Elements with bent or damaged fins are not acceptable.
Make expansion provisions and supports such that element movement is strainfree and noiseless.
[Make face area of the coil not less than that specified on the drawings.]
2.1.3.3 Fan and Drive Assembly
[Provide centrifugal, forward-curved, double-width, double-inlet type fan, that has been statically and dynamically
balanced at the factory.]
[Provide direct fan drives.]
[Provide direct fan drives, except where belt drives are indicated. Provide belt-drive motors that are fitted
with adjustable rails and an adjustable sheave to permit 20 percent adjustment to fan speed. Elastomer mount
independent fan shafts in self-aligning [antifriction] [sleeve-type] bearings, with essentially lifetime lubrication.]
[Provide [two] [three] [four]-speed drives. Provide switch positions that include an off position.]
[Provide rotating elements that are statically and dynamically balanced. Vibration isolate the fan and drive
assembly.] Refer to Section 23 05 48 VIBRATION AND SEISMIC CONTROLS FOR HVAC PIPING AND EQUIPMENT for vibration
isolation considerations.
The maximum allowable direct-drive motor rotational speed is 1,200 rpm.
2.1.3.4 Filters
Provide 25 millimeter 1-inch minimum thickness, replaceable, throwaway type filters conforming to ASTM F 1040
.
Install filters in a bypass-proof frame to ensure filtering of all moving air before entry into heating element.
Ensure filters are removable without tools.
2.1.3.5 Enclosures
NOTE: Architectural and mechanical details not covered herein must be shown
on the drawings or the following must be supplemented.
[Provide enclosure configuration that does not deviate from drawing specifications.]
[Provide enclosure construction consisting of a minimum 1.6 millimeter 16-gage, cold-rolled carbon steel of stretcher-leveled
quality conforming to ASTM A 568/A 568M. Provide construction that has smooth, blemish-free surfaces, without
sharp edges, and with flush joints. Wrinkled-metal and notched-corner construction is not acceptable. Provide
enclosure that has space for all riser pipes and controls. Provide access doors that have tamperproof latches.
Hinge doors and panels to protect surface finishes and personnel.]
[Provide enclosure surface finish that includes manufacturer's standard phosphate pretreatment, prime coat, and
baked enamel finish in color selected by the Contracting Officer.]
2.1.3.6 Insulation
[Insulate backs of recessed units with not less than 13 millimeter 1/2 inch of 48 kilogram per cubic meter 3-pound
per cubic foot density fibrous-glass insulation conforming to NFPA 90A.]
2.1.3.7 Control Cycle
[Sequence operation [as per manufacturer's recommendations] [_____].]
[Provide control components that conform to requirements specified under Section 23 09 33.00 40 ELECTRIC AND
ELECTRONIC CONTROL SYSTEM FOR HVAC.]
2.1.4 Unit Ventilators (UV)
Provide drawings or schedule that include capacity, power rating, heating duty and method, and other pertinent
data.
NOTE: This specification is applicable to both hot water and steam heating equipment.
Where large numbers of units are required, a standard size cabinet is allowed.
Where only one or two units are involved, deletion of polarized plug-in module
requirement is allowed.
2.1.4.1 Type
[Provide quiet-operating modular type unit ventilators, complete with heating elements, fans and drives, filters,
baffles and division walls, dampers, control provisions, and enclosures with access panels.]
[Provide unit pressure components that are rated for service at not less than 1050 kilopascal 150 psi at system
working temperature.]
[Provide intercomponent wiring that conforms to NFPA 70. Provide components of unit assembly that are UL listed
and approved.]
[Provide heating, fan, and control modules that have polarized, color-coded, plug-in connections.]
2.1.4.2 Heating Element
[Provide [the manufacturer's standard aluminum fin,] [serpentine copper-tube type,] drainable and ventable heating
element.]
[Provide heating element with constant and permanent cataloged capacity.]
[Provide seamless deoxidized copper tube material.]
[Mechanically connect fins to the tubes. Regard loose fins at operating temperatures as causing a reduction
in capacity, and replace all such material at no additional cost to the Government. Elements with bent or damaged
fins are not acceptable.]
[Provide expansion provisions and supports that have stainfree and noiseless element movement.]
[Provide coil with face area that is not less than specified drawing dimensions.]
2.1.4.3 Fan and Drive Assembly
Provide centrifugal, forward-curved, double-width, double-inlet type fan, and that is statically and dynamically
balanced.
NOTE: Select, rewrite, or delete the following paragraph only after checking
direct drive units.
[Provide belt driven fans, mounted on a common shaft. Support shaft by independent, elastomer-mounted, self-aligning,
antifriction or sleeve-type bearings with lifetime lubrication. Provide adjustable motor sheave with not less
than 20 percent speed variation either way from capacity point. Provide adjustable belt tension.]
[Provide motor that is manually controlled by two-position on/off switch.]
NOTE: Select the following paragraph for direct drive units in lieu of preceding
paragraph.
[Provide motor that is manually controlled by [three] [four]-position switch.]
NOTE: For very small units, only shaded-pole-type motors are available from
some manufacturers.
Provide elastomer vibration-isolation mounted, permanent split-capacitor type motors with adjustable rail mounting.
2.1.4.4 Filters
Provide 25 millimeter 1-inch minimum thickness, replaceable, throwaway type filters conforming to ASTM F 1040
.
Install filters in a bypass-proof frame to ensure filtering of all moving air before entry into heating element.
Ensure filters are removable without tools.
2.1.4.5 Dampers
Provide opposed-blade type dampers constructed to resist salt air. Provide galvanized steel blades with [mechanically
attached] [secure sealing provisions] not dependent upon adhesives. Provide high-grade commercial quality flanged-type
bearings with extended race and corrosion-resistant steel balls and [plated races] [heat-treated carbon steel]
construction with factory-applied grease conforming to DOD-G-24508, suitable for salt air exposure. Provide
sleeve-type oil-impregnated bronze bearings.
[Provide face and bypass damper with external bypass duct if required by unit.]
[Provide mixing dampers as an assembly within a mixing box. Provide dampers that are capable of varying the
mixed air in any proportion from 100 percent room air to 100 percent outside air.]
2.1.4.6 Enclosures
NOTE: Architectural and mechanical details not covered herein must be shown
on the drawings or the following must be supplemented.
[Provide enclosure configuration per manufacturer's recommendations.]
[Provide enclosure that is not less than 1.6 millimeter 16-gage cold-rolled carbon steel of stretcher-leveled
quality conforming to ASTM A 568/A 568M. Provide smooth construction with blemish-free surfaces, without sharp
edges, and with flush joints. Form and brace enclosure to ensure plane surfaces with no oilcan effect. Wrinkled
metal and notched corner construction is not acceptable. Provide pencilproof venetian type louvers. Provide
louvers that are constructed of metal and, in their normal position, sustain a distributed load of 890 newton
200 pounds, maximum. Provide enclosure that has space for all riser pipes and controls. Provide access doors
that have tamperproof latches.]
[Specially protect enclosure internal surfaces, exposed to condensation and to salt airstream, with [heavy coatings]
[noncorroding materials]. Flash chrome- and cadmium-plating is not acceptable.]
[Provide enclosure surface finish that includes manufacturer's standard phosphate pretreatment, prime coat, and
baked enamel finish. Provide the color selected by the Contracting Officer.]
2.1.4.7 Wall Sleeve
Provide wall sleeve that is constructed of not less than 1.3 millimeter 18-gage galvanized carbon steel, with
commercial zinc weight conforming to ASTM A 653/A 653M. Provide finish that consists of manufacturer's standard
galvanized surface preparation and not less than [two finish coats of baked enamel] [one finish coat of high-build
epoxy]. Provide color selected by the Contracting Officer.
2.1.4.8 Thermal and Acoustic Insulation
Provide insulation to prevent heat loss, heat gain, condensation, and to provide acoustic treatment of surfaces.
2.1.4.9 Control Cycle
NOTE: Select or delete the title and the following two paragraphs or rewrite
and supplement by including the control cycle for this equipment to suit the
project conditions.
[Sequence operation per manufacturer's recommendation's.]
[Provide control components that conform to requirements specified under Section 23 09 33.00 40 ELECTRIC AND
ELECTRONIC CONTROL SYSTEM FOR HVAC.]
2.1.4.10 Fresh Air Intakes
Provide extruded-aluminum intake louvers with 1.6 millimeter 16-gage, 13 by 13 millimeter 1/2-by 1/2-inch mesh
aluminum wire birdscreens for all fresh air intakes. Provide extruded aluminum that is subjected to caustic
etch and 0.5 micrometer anodize treatment in accordance with AA DAF-45. Protect aluminum from dissimilar metals
and causticity of concrete or mortar by elastomeric seals. Provide intake that is particularly suited to indicated
building-construction penetration.
PART 3 EXECUTION
3.1 INSTALLATION
3.1.1 Equipment
Install equipment in accordance with manufacturer's recommendations.
3.1.2 Gas Piping
Install gas piping in compliance with ICC IFGC, NFPA 54 and Section 23 11 25FACILITY GAS PIPING and Section
33 51 15 NATURAL-GAS / LIQUID PETROLEUM DISTRIBUTION.
3.1.3 Combustion Air
Provide Combustion Air in compliance with ICC IMC.
3.1.4 Location
Install heaters in compliance with clearance and mounting height requirements of ICC IFGC and NFPA 70.
3.1.5 Venting
Provide heaters that are vented in compliance with NFPA 54, ICC IMC and ICC IFGC.
3.2 FIELD QUALITY CONTROL
Conduct operational tests per manufacturer's instructions.