ASTM F1005-91(2007)

Standard Practice for HVAC Duct Shapes; Identification and Description of Design Configuration

SIGNIFICANCE AND USE
Standard nomenclature shall be used to facilitate communication between designers, suppliers, and users of HVAC ventilation ductwork components.  
Standard design parameters shall be used to define ventilation ductwork shapes.
Standard variables for design parameters (see 2.2) are useful in writing CAD/CAM software for automatic fabrication of ventilation ductwork shapes.
SCOPE
1.1 This practice covers the identification of design configurations and descriptive nomenclature for sheetmetal HVAC ductwork shapes frequently used in shipbuilding. This practice also covers parametric dimensions of these shapes.  
1.2 This practice does not cover the location of seams or joints within a shape or the method of joining shapes together.  
1.3 Since this practice is not measurement sensitive, it is applicable whether inch-pound or SI metric dimensions are used.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 30-Nov-2007
• ICS: 91.140.30 - Ventilation and air-conditioning systems
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.11 - Machinery and Piping Systems

Relations

• Replaces: ASTM F1005-91(2002) - Standard Practice for HVAC Duct Shapes; Identification and Description of Design Configuration
• Effective Date: 01-Dec-2007
• Replaced By: ASTM F1005-91(2013) - Standard Practice for HVAC Duct Shapes; Identification and Description of Design Configuration
• Effective Date: 01-Oct-2013

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F1005 −91(Reapproved 2007) An American National Standard
Standard Practice for
HVAC Duct Shapes; Identification and Description of Design
Configuration
This standard is issued under the fixed designation F1005; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.1.8 rectangular—rectangular or square cross section.
2.1.9 reducer—a fitting that changes the size but not the
1.1 This practice covers the identification of design configu-
cross-section type of duct.
rations and descriptive nomenclature for sheetmetal HVAC
ductwork shapes frequently used in shipbuilding. This practice
2.1.10 round—circular cross section.
also covers parametric dimensions of these shapes. (See Table
2.1.11 shortaxisofflatoval—curved so that the flat sides of
1.)
the flat oval correspond to the curve.
1.2 This practice does not cover the location of seams or
2.1.12 splitter—internal part of some elbows and offsets;
joints within a shape or the method of joining shapes together.
sometimes required in diverging transitions. Used to provide
1.3 Since this practice is not measurement sensitive, it is more uniform velocity and distribution of air flow.The number
applicable whether inch-pound or SI metric dimensions are and location of splitters is determined by calculation or from a
used. nomograph.
1.4 This standard does not purport to address all of the 2.1.13 straight—duct that remains constant in cross section
safety concerns, if any, associated with its use. It is the and size throughout its length.
responsibility of the user of this standard to establish appro-
2.1.14 throat—wrapper around the inside of a fitting.
priate safety and health practices and determine the applica-
2.1.15 transition—fitting that changes the cross-section type
bility of regulatory limitations prior to use.
of the duct.
2.1.16 vane—internal part of vaned turns. Used to provide
2. Terminology
more uniform velocity of air flow. Configuration, number, and
2.1 Definitions of Terms Specific to This Standard:
location of vanes is determined from drawing, NAVSHIPS No.
2.1.1 branch—portion of a duct system connection to a
S3801-385260. The direction of airflow must be marked on
main duct.
vaned turns.
2.1.2 elbow—a fitting used to change direction of air flow.
2.1.17 vaned turn—a fitting containing vanes that is used to
2.1.3 flat oval—cross section that has flat sides and semicir-
change the direction of air flow.
cular ends.
2.2 Variables Specific to This Standard:
2.1.4 longaxisofflatovalcurvedsothattheflatsidesofthe
A—Angle. Included angle of an elbow, branch, vaned turn,
flat oval remain in a plane.
or slant-top fitting.
2.1.5 offset—fitting that changes the location of the duct
AI—Air In indicates the length of the straight portion of a
with the line of the duct remaining parallel.
vaned turn in the “air in-flow” side.
AO—Air Out indicates the length of the straight portion of
2.1.6 ogee—a smoothly curved type of offset. The inside
curve of each end is tangent to the outside curve of the other a vaned turn on the “air out-flow” side.
B—Distance from the intersection of the center lines of a
end.
branch and the main duct to the end of the main duct.
2.1.7 radius corner—cross section that is generally
CY—Distance between centers of a Y branch.
rectangular, but with the corners softened to a radius.
D—Depth of a part.
DB—Depth of a branch.
This practice is under the jurisdiction of ASTM Committee F25 on Ships and
Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Machinery and Piping Systems. Drawing: Naval Sea Systems Command (NAVSEA) NAVSHIPS S3801-
Current edition approved Dec. 1, 2007. Published January 2008. Originally 385260 Vanes Channels Ventilation Vane, available from Commander, Portsmouth
approved in 1986. Last previous edition approved in 2002 as F1005 - 91(2002). Naval Shipyard, Naval Engineering Drawing Support Activity, Code 202.2,
DOI: 10.1520/F1005-91R07. Portsmouth, NH 03804-5000.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1005−91 (2007)
TABLE 1 HVAC Standard Nomenclature and Numbering System
1. Straight:
1.1 Straight-round
1.2 Straight-flat oval
1.3 Straight-rectangular
2. Offset:
2.1 Offset-round
2.2.1 Offset-flat oval-long axis
2.2.2 Offset-flat oval-short axis
2.3.1 Offset-rectangular-without splitters
2.3.2 Offset-rectangular-with splitters
2.4.1 Offset-ogee-without splitters
2.4.2 Offset-ogee-with splitters
2.5.1 Offset-rectangular reducing-without
splitters
2.5.2 Offset-rectangular reducing-with splitters
3. Elbow:
3.1 Elbow-round
3.2.1 Elbow-flat oval-long axis
3.2.2 Elbow-flat oval-short axis
3.3.1 Elbow-rectangular-without splitters
3.3.2 Elbow-rectangular-with splitters
3.4.1 Elbow-rectangular reducing-without
splitters
3.4.2 Elbow-rectangular reducing-with splitters
3.5.1 Elbow-rectangular transition-without
splitters
3.5.2 Elbow-rectangular transition-with splitters
4. Vaned Turn:
4.1 Vaned turn
5. Reducer:
5.1 Reducer-round
5.2 Reducer-flat oval
5.3 Reducer-rectangular
6. Transition and Bellmouth:
6.1 Transition-flat oval to round
6.2 Transition-rectangular to round
6.3 Transition-rectangular to flat oval
6.4 Transition-rectangular to radius corner
6.5 Transition-radius corner to flat oval
6.6.1 Bellmouth-round
6.6.2 Bellmouth-rectangular
7. Branch:
7.1.1 Branch-round-on equal diameter round
7.1.2 Branch-round-on larger diameter round
7.1.3 Branch-round-on round reducer
7.1.4 Branch-round-on rectangular straight
7.1.5 Branch-round-on rectangular reducer
7.1.6 Branch-round “Y”
7.1.7 Branch-rectangular to round-“Y”
7.2.1 Branch-rectangular-on rectangular straight
7.2.2 Branch-rectangular-on rectangular reducer
DIA—Diameter of a part. RV2—Radius of second splitter at V extension.
DIAB—Diameter of a branch. RV3—Radius of third splitter at V extension.
DIA1—Major diameter of a part. RZ1—Radius of first splitter at Z extension.
DIA2—Minor diameter of a part. RZ2—Radius of second splitter at Z extension.
D1—Major depth of a part. RZ3—Radius of third splitter at Z extension.
D2—Minor depth of a part. R1—Radius of first splitter.
F—Flat section that softens the corner of a vaned turn. R2—Radius of second splitter.
L—Length of a part. R3—Radius of third splitter.
LB—Length of a branch from the end of the branch to the S1—Distance of first splitter from the outside curve of an
point where the centerline of the branch intersects the center- ogee offset.
line of the main duct. S2—Distance of second splitter from the outside curve of
1.1—Major length of a Y branch. an ogee offset.
1.2—Minor length of a Y branch. S3—Distance of third splitter from the outside curve of an
O—Offset in one direction. ogee offset.
R—Radius of a bellmouth. TR—Throat radius is the radius of the inside surface of an
RC—Radius corner. elbow or offset. Normally TR is equal to the width (of a
RV1—Radius of first splitter at V extension. rectangular elbow).
F1005−91 (2007)
TR1—Major throat radius of a reducing offset.
TR2—Minor throat radius of a reducing of
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