USACE / NAVFAC / AFCESA / NASA UFGS-23 37 13 (August 2008)
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Preparing Activity: NASA Superseding
UFGS-23 37 13.00 40 (June 2006)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 23 37 13
DIFFUSERS, REGISTERS, AND GRILLS
08/08
NOTE: This specification covers the requirements for air-diffusion devices
that are connected to ductwork or mounted in equipment], except as otherwise
provided.
Identify air-diffusion devices on the drawings with symbols provided. Where
deviations from standards occur, devise a new symbol within the format used
herein.
Natural aluminum diffusers are unprotected unless specified to be furnished
with clear acrylic or anodizing finishes. Normally, aluminum diffusers specified
without further qualification are supplied with factory baked enamel finish.
Steel diffusers and grilles should be specified with a factory baked enamel
finish.
Show type of DLB frame, bar spacing if other than specified, bar deflection,
blanking if any, and type of damper on drawings.
Show frame style, width, and screw or clip fastening on drawings.
Show linear slot width and number of slots, if other than specified on drawings.
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 and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted 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 will automatically be 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.
[AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS (ASHRAE)ASHRAE 113(2005) Method of Testing for Room Air Diffusion (Repeatable Method of Testing Steady - State Air Diffusion Performance in Occupied Zones of Building Spaces)ASHRAE EQUIP IP HDBK(2004) Handbook, HVAC Systems and Equipment (IP Edition)ASHRAE EQUIP SI HDBK(2004) Handbook, HVAC Systems and Equipment (SI Edition)ASHRAE FUN IP(2005) Fundamentals Handbook, I-P EditionASHRAE FUN SI(2005) Fundamentals Handbook, SI Edition]1.2 GENERAL REQUIREMENTS
NOTE: If Section 23 00 00 AIR SUPPLY, DISTRIBUTION, AND EXHAUST SYSTEMS is
not included in the project specification, applicable requirements therefrom
should be inserted and the following paragraph deleted.
Section 23 00 00 AIR SUPPLY, DISTRIBUTION, AND EXHAUST SYSTEMS applies to work specified in this section.
1.3 PERFORMANCE REQUIREMENTS
Certify air diffusion devices s having been tested and rated in accordance with ASHRAE EQUIP SI HDBK, Chapter
17; ASHRAE FUN SI, Chapter 31 ASHRAE EQUIP IP HDBK, Chapter 17; ASHRAE FUN IP, Chapter 31, and ASHRAE 113, where
such certification is required.
Submit Equipment and Performance Data for air-diffusion devices consisting of [sound data in terms of Noise Criteria
(NC) index for the capacity range of the device.] [sound data in terms of sound-power level in octave bands second
through eighth and Noise Criteria (NC) index for the capacity range of the device. Where room attenuation is
not specified or indicated, assume 18 decibels. Where space or sound data are not specified or indicated, assume
NC40.]
1.4 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. Submittals should be kept 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, a code of up
to three characters within the submittal tags may be used 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 will review the submittal for the Government.] Submit the following
in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-01 Preconstruction Submittals
Submit the following in accordance with this section.
Material, Equipment, and Fixture Lists
Records of Existing Conditions
SD-02 Shop Drawings
Submit Fabrication Drawings for air-diffusion devices in accordance with this section.
Submit Installation Drawings for air-diffusion devices in accordance with the paragraph entitled,
"Installation," of this section.
SD-03 Product Data
Submit Equipment and Performance Data for air-diffusion devices in accordance with paragraph
entitled, "Performance Requirements," of this section.
SD-04 Samples
Submit Manufacturer's Standard Color Chart in accordance with this section.
SD-10 Operation and Maintenance Data
Provide operation and maintenance manuals consistent with manufacturer's standard brochures,
schematics, printed instructions, general operating procedures and safety precautions.
Provide manuals for the following air-diffusion devices:
Type TS Supply Troffer
Type TSR Combination Supply and Return Troffer
PART 2 PRODUCTS
2.1 AIR-DIFFUSION DEVICE CONSTRUCTION
Preclude flutter, rattle, or vibration on air-diffusion device construction and mounting. Refer to Section
23 05 48 VIBRATION AND SEISMIC CONTROLS FOR HVAC PIPING AND EQUIPMENT for vibration isolation considerations.
Modify devices and provide accessories necessary for mounting in indicated surface construction.
[Select color from Manufacturer's Standard Color Chart which indicate the manufacturer's standard color selections
and finishes for air-diffusion devices.]
[Match color with architectural background.]
[Provide color as indicated on drawings.]
Provide supply diffusers with combination damper and equalizing grid. Ensure dampers are extracting-splitter
type, except as otherwise indicated.
Ensure air-diffusion device volume and pattern adjustments can be made from the face of the device. Make volume
adjustments by [removable key] [tamper-deterring device].
Provide gaskets for supply-terminal air devices mounted in finished surfaces.
Include within the Material, Equipment, and Fixture Lists the 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 Contractor's 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.
Submit Fabrication Drawings for air-diffusion devices consisting of fabrication and assembly details to be performed
in the factory.
2.2 TYPES OF AIR-DIFFUSION DEVICES
2.2.1 Type DRA
Provide type DRA supply diffuser, round with five or more expanding cones with beaded edges to provide hemispherically
diffused discharge air. Arrange cones to provide a minimum of [four] [_____] air paths which simultaneously
diffuse air at 6 to 15 meter per minute 20 to 50 feet per minute (fpm) and aspirate room air at 25 to 35 percent
of discharge volume.
Provide aluminum diffuser with baked enamel finish.
Provide antismudge rings and extended cones.
2.2.2 Type DRB
Provide type DRB supply diffuser, round with [four] [_____] more expanding cones to provide hemispherically diffused
discharge air. Arrange cones to provide a minimum of [three] [______] air paths which simultaneously diffuse
air at 6 to 15 meter per minute 20 to 50 fpm. Provide a pattern adjustment range from horizontal to downward
projection, and any intermediate point, when mounted on exposed ductwork.
Provide aluminum diffuser with baked enamel finish.
Provide [Integral] [Separate] antismudge rings and extended cones.
2.2.3 Type DRC
Provide type DRC combination supply and return diffuser, round with four expanding cones. Arrange cones to provide
one return air path and two supply air paths. Provide a butterfly supply-air damper and an annular return-air
damper. [Provide a baked enamel finish][Provide aluminum construction.]
[Provide antismudge rings.]
2.2.4 Type DRE
Provide type DRE supply diffuser, round with [three] [_____] expanding cones to provide discharge air paths,
minimally, two-position adjustable for horizontal or vertical discharge.[Provide a baked enamel finish]
[Provide antismudge rings.]
2.2.5 Type DRH
Provide type DRH supply diffuser, half-round with [four] [_____] semiconical expanding members to discharge diffused
air in a 180-degree pattern. Arrange cones to provide a minimum of [three] [_____] air paths which simultaneously
diffuse air at 6 to 15 meter per minute 20 to 50 fpm. Provide opposed-blade volume control.
[Provide a baked enamel finish]
[Provide antismudge rings.]
2.2.6 Type DP Series
Provide type DP series supply diffuser with a [square] [rectangular], perforated, hinged, face plate with [opposed
blade] [splitter-damper] volume control, white baked enamel exterior finish, and black matte finish on exposed-to-view
interior surface.
[Provide one-way deflection.]
[Provide two-way opposed deflection.]
[Provide two-way diagonal deflection.]
[Provide three-way deflection.]
[Provide four-way deflection.]
2.2.7 Type DLB
Provide type DLB supply diffuser, linear bar type, frame mounted, with extruded-aluminum bar and frame.
Bars shall be [6] [1/4] [_____] millimeter [_____] inch thick by [19] [3/4] [_____] millimeter [_____] inch high,
[13] [1/2] [_____] millimeter [_____]inch on center. Bar spacing shall be pencilproof. Bar deflection angle
shall be zero degrees.
For floor- and sill-mounted diffusers provide heavy-duty reinforced construction to carry loads of not less than
[490] [100] [_____] kilogram per square meter [_____] pounds per square foot.
Provide continuous length diffuser with hairline butt joints.
Provide mitered end caps where diffuser run terminates.
Provide opposed-blade type dampers.
Provide an integral, pivoted, bar-type access door where indicated.
Provide straightening grids where indicated.
2.2.8 Type DLS
Provide type DLS supply diffuser, linear slot type, extruded aluminum construction, with fully adjustable integral
air pattern and volume control vanes that deflect air pattern from horizontal along ceiling to straight down,
or any intermediate setting and a pattern control element that permits complete blanking-off of slot.
Slot width shall be [19] [3/4] [_____] millimeter [_____] inch.
Provide number of slots per unit run as indicated.
Align butts in continuous runs for hairline joints.
Butt ends of diffuser against walls without mitered end caps. Provide end caps where slot terminates.
Provide exposed-to-view part of frame with anodized aluminum, and all interior exposed-to-view components with
a black matte finish.
2.2.9 Type DSA
Provide type DSA supply diffuser, square with [four] [_____] expanding flared members to provide radically diffused
discharge air. Arrange flared members to provide a minimum of four air paths which simultaneously diffuse air
at 6 to 15 meter per minute 20 to 50 fpm. Include pattern adjustments horizontal, vertical projection, and an
intermediate position or range.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
[Provide antismudge rings.]
[Provide integral extended surface to fit into module of lay-in ceiling.]
2.2.10 Type GS
Provide type GS supply grille double deflection type with adjustable face bars parallel to short dimension and
adjustable rear bars parallel to long dimension.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
[Provide antismudge rings.]
[Provide integral extended surface to fit into module of lay-in ceiling.]
2.2.11 Type GR
Provide type GR return grilles, single deflection type with fixed face bars.
Provide grilles installed in vertical surfaces with horizontal face bars set downward at 35 degrees from vertical.
Provide grilles installed in horizontal surfaces with face bars straight and parallel to short dimension.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
[Provide antismudge rings.]
[Provide integral extended surface to fit into module of lay-in ceiling.]
2.2.12 Type GCA
Provide type GCA with an individually adjustable, horizontal, curved-blade grille and a one-way pattern.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.13 Type GCB
Provide type GCB with an individually adjustable, vertical, curved-blade grille and a one-way pattern.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.14 Type GCD
Provide type GCD with an individually adjustable, vertical, curved-blade grille and a two-way pattern.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.15 Type GCE
Provide type GCE with an individually adjustable, vertical and horizontal, curved-blade grille and a three-way
pattern.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.16 Type GCF
Provide type GCF with an individually adjustable, vertical and horizontal, curved-blade grille and a four-way
pattern.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.17 Type RS
Provide type RS supply register, double-deflection type, with adjustable face bars parallel to short dimension
and adjustable rear bars parallel to long dimension with opposed-blade type dampers.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
[Provide integral extended surface to fit into module of lay-in ceiling.]
2.2.18 Type RR
Provide type RR return register, single-deflection type with fixed face bars with opposed-blade dampers.
Provide registers installed in vertical surfaces with have horizontal face bars set downward at approximately
35 degrees from vertical.
Provide registers installed in horizontal surfaces with face bars set straight and parallel to short dimension.
[Provide a baked enamel finish.]
2.2.19 Type RCA
Provide type RCA with an individually adjustable, horizontal, curved-blade register and a one-way pattern with
opposed-blade damper.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.20 Type RCB
Provide type RCB with individually adjustable, vertical, curved-blade register and a one-way pattern with opposed
blade damper.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.21 Type RCC
Provide type RCC with an individually adjustable, horizontal, curved-blade register and a two-way pattern with
opposed blade damper.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.22 Type RCD
Provide type RCD with an individually adjustable, vertical, curved-blade register and a two-way pattern with
opposed blade damper.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.23 Type RCE
Provide type RCE with an individually adjustable, vertical and horizontal, curved-blade register and a three-way
pattern with opposed-blade damper.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.24 Type RCF
Provide type RCF with an individually adjustable, vertical and horizontal, curved-blade register and a four-way
pattern with opposed-blade damper.
[Provide a baked enamel finish.]
[Provide aluminum construction.]
2.2.25 Type TS
Provide type TS supply troffer complete assembly as specified in Section 26 51 00 INTERIOR LIGHTING and as indicated.
Install air handling section of unit under this section.
2.2.26 Type TR
Provide type TR return troffer conforming to requirements for Type TS supply troffer.
2.2.27 Type TSR
Provide type TSR combination supply and return troffer assembly as specified in Section 26 51 00 INTERIOR LIGHTING
and as indicated. Install air handling section of unit under this section.
PART 3 EXECUTION
3.1 INSTALLATION
Install equipment as indicated and specified and in accordance with manufacturer's recommendations.
[Mount wall-mounted supply registers 150 millimeter 6 inches below ceiling.]
[Mount wall-mounted return registers 150 millimeter 6 inches above the finished floor.]
Submit installation Drawings for air-diffusion devices. Indicate on drawings overall physical features, dimensions,
ratings, service requirements, and equipment weights.