Template for report - BIMMEPAUS · BIM-MEPAUS 2 June 2016 ... are non-core data and can be managed either in the Revit MEP model or off model in a scheduling database

BIM-MEPAUS SPECIFICATION Ductwork sound attenuators

Issued By: BIM-MEPAUS

30 Cromwell Street, Burwood 3205 VIC Australia

Revision: D

Date June 2016

BIM-MEPAUS Specification

Ductwork sound attenuators

BIM-MEPAUS i

June 2016

Acknowledgements BIM-MEPAUS acknowledges the contributions of those organisations involved in the development and review of this

specification including principal contributors:

Australian Chamber of Commerce and

Industry

A.G. Coombs Pty Ltd

A.G. O’Connor Pty. Ltd.

D&E Air Conditioning Pty Ltd

Watson Fitzgerald & Associates Pty Ltd

Fantech Pty Ltd

Formatting conventions

The following table shows text formats used in BIM-MEPAUS documentation and their application

Text Type Example Indicates

Italicised text BIM Execution Plan The generic title for a type of document

Bold italicized text BIM-MEPAUS specification The name of a referenced document

Red bold text LOD First reference to a term or abbreviation that is

defined in the website glossary under Practices

Blue text www.bimmepaus.com.au Hyperlink / web link

Blue italicised text Explanatory notes Explanatory notes or reference information.

Green bold text Future development Sections or documents that are still under

development by BIM-MEPAUS.

Keeping BIM-MEPAUS up-to-date

BIM-MEPAUS specifications, templates and content are updated to reflect changes in legislation, technology and

industry practice. Feedback and suggestions are welcome and can be made via the BIM-MEPAUS website. Updates

are managed and delivered through the BIM-MEPAUS website.

Liability Disclaimer

BIM-MEPAUS makes no warranty, expressed or implied, including but not limited to any implied warranties of

merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the accuracy,

completeness, or usefulness of the information in this document.

In no event shall BIM-MEPAUS or its agents be liable for damages or losses resulting from your use of, or reliance

on the information provided in this document.

COPYRIGHT © BIM-MEPAUS All rights reserved.

http://www.bimmepaus.com.au/



BIM-MEPAUS ii

June 2016

Table of Contents

1 INTRODUCTION .............................................................................................................. 1

1.1 Scope ........................................................................................................................................................ 1

1.2 BIM-MEPAUS reference documents ............................................................................................................ 1

1.3 Objectives .................................................................................................................................................. 1

1.4 Model classification ................................................................................................................................... 1

2 REFERENCED STANDARDS .......................................................................................... 2

3 MODEL WORKFLOW ...................................................................................................... 3

3.1 Model Workflow ......................................................................................................................................... 3

3.2 Generic design model ................................................................................................................................ 3

3.3 Manufacturer certified model ..................................................................................................................... 3

3.4 Commissioned AS-Built model .................................................................................................................. 4

4 SHARED PARAMETER SCHEDULING ........................................................................... 5

5 ATTENUATOR SPECIFICATION ..................................................................................... 7

5.1 Attenuator insertion losses ........................................................................................................................ 7

5.2 Attenuator sizing ........................................................................................................................................ 7

5.3 Material selection....................................................................................................................................... 7

5.4 Pressure losses ......................................................................................................................................... 7

5.5 Connectors ................................................................................................................................................ 7

6 REVIT FUNCTIONALITY ................................................................................................. 8

6.1 Categories ................................................................................................................................................. 8

6.2 Functional type classification ..................................................................................................................... 8

6.3 Family naming syntax ................................................................................................................................ 8

6.4 Family/type version control ........................................................................................................................ 8

6.5 Omniclass .................................................................................................................................................. 9

6.6 Connector settings ..................................................................................................................................... 9

6.7 Family geometry ...................................................................................................................................... 10

6.8 Model visualization .................................................................................................................................. 10

7 PARAMETER SCHEDULES ...........................................................................................12

7.1 Identity Schedule ..................................................................................................................................... 12

7.2 BIM classification schedule ..................................................................................................................... 13

7.3 Performance/quality schedule ................................................................................................................. 13

7.4 Manufacturer schedule ............................................................................................................................ 16

7.5 Completion schedule ............................................................................................................................... 16

7.6 Generic design model schedule .............................................................................................................. 17

7.7 MCM Schedule ........................................................................................................................................ 18



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June 2016

1 INTRODUCTION

1.1 Scope

This document sets out the BIM-MEPAUS specification for the following families:

Ductwork rectangular sound attenuators

Ductwork circular sound attenuators.

1.2 BIM-MEPAUS reference documents

This specification should be read in conjunction with the following specifications and documents:

BIM-MEPAUS Ducting systems, plant and equipment schedule – this Excel based schedule provides

the complete listing of ductwork systems, plant and equipment names as well as the system colour

schema.

BIM-MEPAUS Master Shared Parameter Schedule – this document provides the reference source for all

shared parameter names used within BIM-MEPAUS IFM Generic Design and manufacturer certified

model (MCM) content models together with the Revit MEP classification of each parameter and its

associated BIM-MEPAUS GUID.

BIM-MEPAUS Plant, equipment and fitting scheduling specification– this document sets out the

technical and workflow requirements in relation to shared parameter scheduling.

These documents can be accessed through the BIM-MEPAUS website.

1.3 Objectives

Benefits sought through the development and implementation of this BIM-MEPAUS specification include:

A structured approach to the specification and modelling of ductwork sound attenuators;

Reliable and accurate Design to Commissioned As-built workflows; and

Industry standardization delivering improved supply chain efficiency and reduced project costs and risks

to the client and project team.

1.4 Model classification

Attenuators covered by this standard are classified as duct accessories within Revit.

Within the BIM-MEPAUS plant, equipment and fitting classification system attenuators are classified as equipment.



BIM-MEPAUS 2

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2 REFERENCED STANDARDS

There are a number of requirements in the National Construction Code as well as relevant Australian and

international standards that relate to attenuator design, selection and test methods.

Codes and Standards referenced in this specification include:

General requirements

NCC/ BCA : National Construction Code / Building Code of Australia

Air handling systems

AS 4254.2 - 2012 : Ductwork for air-handling systems in buildings - Part 2: Rigid duct.

AS 1668.1 -2015 : The use of ventilation and air conditioning in buildings – Part 1: Fire and Smoke

Control in multi-compartment buildings

AS 1668.2 -2015 : The use of ventilation and air conditioning in buildings – Part 2: Mechanical

Ventilation in buildings

Attenuators

BS 4718 : 1971 : Methods of test for silencers for air distribution systems

AS 1277 :1983 : Acoustics – Measurement procedures for ducted silencers

ISO 7235 : 2003 : Acoustics – Laboratory measurement procedures for ducted silencers and air-

terminal units – Insertion loss, flow noise and total pressure loss

ISO BS EN 7235:2009 : Acoustics. Laboratory measurement procedures for ducted silencers and air-

terminal units. Insertion loss, flow noise and total pressure loss

ASTM E477-06a : Standard Test Method for Measuring Acoustical and Airflow Performance of

Duct Liner Materials and Prefabricated Silencers

ASTM E477-13e1 : Standard Test Method for Laboratory Measurements of Acoustical and Airflow

Performance of Duct Liner Materials and Prefabricated Silencers



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3 MODEL WORKFLOW

3.1 Model Workflow

One of the fundamental aims of BIM-MEPAUS is to enable efficient BIM based workflows that see the design model

progressively refined through the design and construction process to ultimately deliver a completed commissioned

as-built record model.

A key step in this process is the change-out of the generic design components within the virtual construction model

with manufacturer’s certified model (MCM) components as part of the virtual construction build. These MCMs are

then able to be leveraged through construction, commissioning and facility management workflows.

3.2 Generic design model

BIM-MEPAUS generic design family content provides a catalogue of types that allow designers to spatially model to

LOD 300 as well as specify the attenuator’s performance and quality requirements for most HVAC applications.

The BIM-MEPAUS generic design models incorporate the shared parameters developed through industry

consultation that are considered necessary to schedule the quality and performance requirements for tendering and

procurement purposes.

Design firms can pre-populate their content library attenuator design families with their quality specification shared

parameter values in order to reduce repetitive data entry. This approach limits subsequent scheduling to only those

instance based geometry and performance parameters that are typically scheduled in specification equipment

schedules.

3.3 Manufacturer certified model

The virtual build develops the design model into the LOD 400 construction model and typically involves changing

out the design attenuator model with the manufacturer certified attenuator model. Where the manufacturer’s

attenuator model is BIM-MEPAUS compliant this can be easily completed.

Manufacturer’s attenuator models are preferably generated from the BIM-MEPAUS industry foundation models and

are single type families that provide the manufacturer specific instance based shared parameter data for the

attenuator to be supplied for the project.

BIM-MEPAUS certified manufacturer models are fully interchangeable with the generic design models and provide:

Accurate geometry

Performance data

Full BIM-MEPAUS Revit operability.

Where the data is not able to be provided by the manufacturer in Revit content - manufacturer’s shared parameter

data should be delivered in Excel format structured allowing the data to be imported by the specialist trade contractor

to their scheduling database or Revit Virtual Construction model.

As the MCM and supporting shared parameter schedule replaces the certified drawings and technical schedules

traditionally provided by manufacturers, the model accuracy should be no more, or less than, that provided by the

equivalent manufacturer’s certified drawing.

Manufacturer’s Certified Models should preferably include a link to a pdf or web page providing pre-commissioning

checklists for modellers and shop drawers to facilitate the proper incorporation of the component into the model as

well as providing the pre-commissioning check sheet for the project site team.



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3.4 Commissioned AS-Built model

The commissioned as-built model comprises the construction model updated to reflect any changes made during

the field installation.

Attenuators are rarely subject to commissioning or on-site testing with the possible exception of measurement of

design air flow pressure loss and hence there is no commissioning schedule provided for this family.



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4 SHARED PARAMETER SCHEDULING

The shared parameter schema has been developed to effectively support data requirements for design,

procurement and commissioning as well as life cycle asset management.

All BIM-MEPAUS plant and equipment models have the same schedule structure shown below.

Identity

BIM Classification

System Analysis

Green Building Properties

Performance / Quality

Manufacturer

Commissioning

Completion

System Analysis, Green Building Properties and Commissioning schedules are only included where applicable or

where they have been defined.

The schedules are progressively completed as the MEP services model progresses through design and virtual

construction to a fully completed Commissioned As-built component within the final model.

Schedule Section Generic Design / MCM

Model schedule

Schedule completion by

Identity Generic design model Designer / Manufacturer / Installer

BIM Classification Generic design model Designer

System Analysis Generic design model Designer

Green Building Properties Generic design model / MCM model Designer / Installer / Manufacturer

Performance /Quality Generic design model / MCM model Designer / Installer

Manufacturer MCM model Manufacturer

Commissioning MCM model Installer

Completion Schedule MCM model Installer

The identity and completion schedules must be completed for all components and once the value is defined is fixed

for the life project model.

It is expected that not all data will be carried in the Revit design or virtual construction model with non-core data

likely to be managed off model using scheduling databases and/or spreadsheets. This non-core data is commonly

required for the finalization of procurement, commissioning and facility management purposes.

Manufacturer BIM data must be supplied in a format that can be imported into a data management system and/or

Revit Virtual Construction model with suitable formats including:

MCM model with MCM Revit shared parameter schedule

MCM model and MCM Revit shared parameter schedule with core manufacturer data and supporting MCM

Excel File.

To allow efficient and reliable data exchanges, it is critical that the BIM-MEPAUS shared parameter names and

respective GUIDs be used.



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Parameters indicated in bold font are core Revit model data expected to reside in the model whilst those in italics

are non-core data and can be managed either in the Revit MEP model or off model in a scheduling database.

Parameters notated with the symbol have an industry defined set of allowable values or descriptions that are

listed in the master BIM-MEPAUS shared parameter schedule.

It is noted that BIM-MEPAUS compliant manufacturer’s certified models can be used for basis of design where deemed appropriate by the designer and/or where specific manufacturer plant and equipment is to be nominated.



BIM-MEPAUS 7

June 2016

5 ATTENUATOR SPECIFICATION

The following guidance has been developed through industry consultation for the completion of the quality and

performance attenuator schedule.

5.1 Attenuator insertion losses

The test standard used for the determination of the attenuator performance has a significant bearing on the insertion

loss data.

Generally the ISO based standards are considered to provide more conservative insertion loss data.

For HVAC applications the key attenuator performance characteristics are considered to be the lower frequencies,

in particular the 63Hz and 125Hz insertion losses.

5.2 Attenuator sizing

Sizing is based on airway size for round attenuators and sheet metal (casing) size for rectangular attenuators.

Circular attenuators are typically designed to fit directly to the fan and hence are sized to match the standard fan

ring flange – they are therefore scheduled on airway size.

Rectangular attenuators are typically sized based on casing size and hence are scheduled on sheet metal size.

5.3 Material selection

The default material is galvanised sheet metal construction with alternatives including stainless steel.

Acoustic absorption material is generally specified to be glass wool 32kg/m3.

Where a vapour barrier is required a continuous acoustic membrane is generally considered preferable over a PET

based facing such as MylarTM which is difficult to fabricate with.

5.4 Pressure losses

Attenuator pressure loss is highly dependent on both its size and aspect ratio and hence the use of a family KT

value is generally not feasible. Pressure losses are calculated using laminar flow conditions and poor inlet conditions

can significantly impact on the installed pressure losses.

5.5 Connectors

Connectors are based on:

35 TDF frame connections

Rectangular Angle Iron

Round Flange

Insert nuts



BIM-MEPAUS 8

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6 REVIT FUNCTIONALITY

6.1 Categories

All attenuator families are designated in Revit MEP as duct accessories.

6.2 Functional type classification

The design and manufacture models functional type and sub-type are:

Functional Type : Attenuator

Sub Type : Rectangular or Circular.

6.3 Family naming syntax

The attenuator family naming convention is as follows

Format:

Generic Design : <Functional Type>_< Sub-Functional Type>_<Generic>_<IFM>

MCM : <Functional Type>_< Sub-Functional Type>_<ManufacturerName>_<Type Descriptor>

Example:

Generic Design Model

Attenuator_Rectangular_Generic_IFM

or

Attenuator_Circular_Generic_IFM

Manufacturer Certified Model

Attenuator_Rectangular_Manufacturer Name_025L

or

Attenuator_Circular_Manufacturer Name_10KRT

6.4 Family/type version control

Family Identification parameters are used for source and version control and are embedded in the family

parameters. They do not appear in the BIM-MEPAUS shared parameter schedules for the family as they are not

intended to be generally modified by designers or constructors.

IFM / Generic Design – Multiple Type

Family Identification Unit /Type Sample Value

FamilyName Text Attenuator_Rectangular_ Generic_BMAIFM

Version Text 2016-01

CreatedOn Text 201607

CreatedBy Text BMA



BIM-MEPAUS 9

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Manufacturer’s Certified Model – single type

Family Identification Unit /Type Value

FamilyName Text Attenuator_Rectangular_ Manufacturer Name_ RT

TypeName Text 10G

Version Text 2016-01

CreatedOn Text 20160831

CreatedBy Text Modelling Company Name

6.5 Omniclass

The BIM Classification Code is a Revit System Parameter.

System Parameter Unit /Type Value

OmniClassNumber Text 23.33.00.00.00

6.6 Connector settings

The following Revit connectors are applied to the model:

Rectangular Attenuator:

ID Connector System Placement Shape/Type Direction Calculation

Method

1 Inlet Duct GLOBAL Face TDF, Angle Iron Bi-directional Calculated

2 Outlet Duct GLOBAL Face TDF, Angle Iron Bi-directional Calculated

Circular Attenuator:

ID Connector System Placement Shape / Type Direction Calculation

Method

1 Inlet Duct GLOBAL Face Round Flange,

Nut Insert

Bi-directional Calculated

2 Outlet Duct GLOBAL Face Round Flange,

Nut Insert

Bi-directional Calculated



BIM-MEPAUS 10

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6.7 Family geometry

Family Geometry is controlled by type based parameters with the intention that the modeller should not need to

modify the geometry of Generic Design Models or Manufacturer’s Certified Models.

It is noted that the Family Dimension Parameters are used to schedule those parameters that define the type (size

or capacity), with all detailed geometry dimensions listed separately under the Geometry Grouping.

Critical dimensions in relation to the model geometry are:

Rectangular Attenuator:

Sheet Metal Width;

Sheet Metal Depth;

Length

duct connections;

o TDF

o Angle iron

Circular Attenuator:

Internal Diameter;

Length;

duct connections;

o nut-sert

o matching flange

6.8 Model visualization

The industry foundation models (IFM) for rectangular and circular attenuators have different visualizations for the

levels of detail available in REVIT. These visualizations are indicated below.

3D Course

3D Medium

3D Fine



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2D Course

2D Medium

2D Fine



BIM-MEPAUS 12

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7 PARAMETER SCHEDULES

The schedule structure and parameters were developed to meet the needs of the BIM-MEPAUS integrated project

delivery workflow as well as support asset life cycle requirements.

Refer to Section 4 - Shared Parameter Scheduling for a detailed overview of the intended use and application of

the schedules.

Parameter fields indicated in black bold text are provided with the generic design model.

7.1 Identity schedule

Figure 7.1 Identity Schedule

Design Parameters Unit / Type Sample Value

ComponentName Text M-ATT-10-1

SystemServed Text AHU-12

Location Text Level 10 Plantroom

ComponentStatus Text CAB

MCM Parameters Unit /Type Sample Value

Manufacturer Text Manufacturer Name

Model Text Model Name

ProductCode Text Product Code

SerialNumber Text Attenuator Serial Number

ManufacturerURL Text Manufacturers product URL

FM Parameters Unit /Type Sample Value

AssetIdentifier Text M –ATT-AHU-12-1

Barcode Text Barcode Number

RFID Text RFI Tag Number



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7.2 BIM classification schedule

The BIM Classification Codes are based on the OmniClass Construction Classification System (known as

OmniClass™ or OCCS) for the construction industry and Natspec.

Fig 7.2 BIM classification schedule

Parameters Unit /Type Sample Value

OmniClassNumber Text 23-33 49 21 17

OCCS_ElementNumber Text 21-04 30 50 50

OCCS_ElementName Text Ductwork Sound Attenuators

NATspecWorkSection Text 0745

Detailed definition of Products and Elements can be found at http://www.omniclass.org/tables.asp with the following

relevant codes noted:

NATspec’s Work Section classification system can be found at

www.natspec.com.au/Products_Services/listallworksection.asp .

7.3 Performance/quality schedule

The performance and quality schedule details the specified requirements for the attenuator – completion of the

schedule is generally considered equivalent to LOD 300 – LOD375.

The schedule brings together a number of typical specification section requirements including those related to

attenuator design and acoustic and airflow related performance parameters.

The Manufacturer’s certified model may overwrite some sections of the schedule replacing the design performance

requirements with submitted performance data.

http://www.omniclass.org/tables.asp

http://www.natspec.com.au/Products_Services/listallworksection.asp



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Figure 7.3.1 Rectangular attenuator performance/quality schedule

Parameter Unit/Type Sample Value

AttenuatorType Text Rectangular

Width mm 1200

Depth mm 600

Length mm 600

AirFlow L/s 1200

Pressure Loss Pa 50

ConnectorC1 Text TDF-35


PodOrientation Text Vertical

AttenuatorMaterialType Text Galvanised steel

ProtectiveCoatingType Text Epoxy

InsulationType Text Glass wool

InsulationFacingType Text None

InsertionLossType Text Static

InsertionLoss63Hz dB 3








TestStandard Text ISO7235 : 2003

BasisOfDesign Text Manufacturer Model Name



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Figure 7.3.2 Circular attenuator performance/quality schedule


AttenuatorType Text Circular

Diameter mm 600

Length mm 600

AirFlow L/s 1200

Pressure Loss Pa 50

ConnectorC1 Text Insert Nut

ConnectorC2 Text Insert Nut

Podded Yes/No Yes














TestStandard Text ISO7235




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7.4 Manufacturer schedule

Manufacturer’s schedules are completed by suppliers to confirm the detailed performance, quality and configuration

selections.

Figure 7.4.1 Manufacturers Schedule


AirwayFreeArea% Number 50

PerfFreeArea% Number 11

SplitterType Text Tapered

InsulationDensity kg/m3 32

Weight Number 100

7.5 Completion schedule

The completion schedule provides key asset and facility maintenance data and is standard for the BIM-MEPAUS

plant and equipment families:

Figure 7.5.1 – Completion schedule


Designer Text Designer Name

Installer Text Installer Member

Client Text Client Name

InstallationDate Text 2013-09-31

WarrantyStartDate Text 2014-03-31

WarrantyDurationMonths Integer 12

ExpectedServiceLifeYears Integer 25



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7.6 Generic design model schedule

The following schedule defines the generic design model shared parameter schedule (based on a rectangular

attenuator) and, indicated in bold, the default shared parameter values provided with the BIM-MEPAUS generic

design model.

Parameters Unit / Type Default / Sample Value

ComponentName Text Component Name

SystemServed Text System Name

Location Text Location Name

ComponentStatus Text DD


Width mm 1000

Depth mm 600

Length mm 600

AirFlow L/s 0

Pressure Loss Pa 0





ProtectiveCoatingType Text None













BasisOfDesign Text None



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7.7 MCM schedule

The following schedule defines the MCM shared parameter schedule (based on a rectangular attenuator) and

representative sample values forming the basis of a completed as-built attenuator schedule.

Parameters Unit / Type Sample Value

ComponentName Text M_ATT_10-1

SystemServed Text AHU-12

Location Text Level 10 Plantroom

ComponentStatus Text CKD

Manufacturer Text Manufacturer Name

Model Text Model Name

ProductCode Text Product Code

SerialNumber Text Attenuator Serial Number

URL Text Manufacturers URL


Width mm 1200

Depth mm 600

Length mm 600

AirFlow L/s 1200

Pressure Loss Pa 50













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AirwayFreeArea% Number 50

PerfFreeArea% Number 11

PodType Text Tapered

InsulationDensity kg/m3 32

Weight kg 100



Installer Text Installer Name


InstallationDate Text 2013-09-31

WarrantyStartDate Text 2014-03-31

WarrantyDurationMonths Integer 12

ExpectedServiceLifeYears Integer 25

END

Documents

Template for report - BIMMEPAUS · BIM-MEPAUS 2 June 2016 ... are non-core data and can be managed either in the Revit MEP model or off model in a scheduling database