AS 4254-1995

1 - AS 4254-1995 DUCTWORK FOR AIR-HANDLING SYSTEMS IN BUILDINGS
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE AND GENERAL
6 - 1.1 SCOPE
6 - 1.2 NEW DESIGNS AND INNOVATIONS
6 - 1.3 APPLICATION
6 - 1.4 REFERENCED DOCUMENTS
7 - 1.5 DEFINITIONS
7 - 1.5.1 Airflow rate (herein referred to as flow rate)
7 - 1.5.2 Air-handling plant
7 - 1.5.3 Air-handling system
7 - 1.5.4 Air-pressurization system
7 - 1.5.5 Air outlet
7 - 1.5.6 Approved and approval
7 - 1.5.7 Combustible
7 - 1.5.8 Compartment
7 - 1.5.9 Downstream
7 - 1.5.10 Duct
7 - 1.5.11 Duct liner
7 - 1.5.12 Exhaust air
7 - 1.5.13 Exhaust air intake
7 - 1.5.14 Exhaust outlet
7 - 1.5.15 Facing material
7 - 1.5.16 Fail-safe
7 - 1.5.17 Fire alarm
7 - 1.5.18 Fire damper
7 - 1.5.19 Fire-isolated
7 - 1.5.20 Fire resistance level (FRL)
8 - 1.5.21 Fire-resisting
8 - 1.5.22 Flexible connection
8 - 1.5.23 Flexible duct
8 - 1.5.24 Hood
8 - 1.5.25 Infiltration air
8 - 1.5.26 Insulated flexible duct
8 - 1.5.27 Insulation
8 - 1.5.28 Jacket/sleeve
8 - 1.5.29 Joint
8 - 1.5.30 Leakage air
8 - 1.5.31 May
8 - 1.5.32 Objectionable effluent
8 - 1.5.33 Outdoor air
8 - 1.5.34 Outdoor air intake
8 - 1.5.35 Plant room
8 - 1.5.36 Plenum
8 - 1.5.37 Recycled air
8 - 1.5.38 Regulatory authority
8 - 1.5.39 Relief air
8 - 1.5.40 Required
8 - 1.5.41 Return air
8 - 1.5.42 Seam
8 - 1.5.43 Shall
9 - 1.5.44 Should
9 - 1.5.45 Spill air
9 - 1.5.46 Supply air
9 - 1.5.47 Upstream
9 - 1.6 GENERAL REQUIREMENTS
9 - 1.7 STATIC PRESSURE CLASSIFICATION
10 - 1. 8 GALVANIZED STEEL THICKNESS
10 - 1. 9 TESTING
11 - SECTION 2 DUCT CONSTRUCTION AND INSTALLATION
11 - 2.1 DUCT WORK
11 - 2.1.1 General
11 - 2.1.2 Kitchen exhaust ductwork
11 - 2.2 DUCT SEALING
11 - 2.2.1 General
13 - 2.2.2 Kitchen exhaust ductwork sealing
13 - 2.2.3 Sealing media
13 - 2.2.4 Surface preparation
13 - 2.2.5 Leakage
14 - 2.3 RECTANGULAR DUCT REINFORCEMENT
14 - 2.3.1 General
15 - 2.3.2 Longitudinal seams for rectangular duct (LS)
15 - 2.3.3 Tie rods (t)
48 - 2.4 ROUND DUCT CONSTRUCTION
56 - 2.5 OVAL DUCT CONSTRUCTION
58 - 2.6 HANGERS AND SUPPORT SYSTEMS
66 - 2.7 DUCT LINERS AND INSULATION
66 - 2.7.1 Duct liners
68 - 2.7.2 Insulation for rigid ducts
68 - 2. 8 FLEXIBLE DUCTWORK
68 - 2.8.1 Construction
68 - 2.8.2 Compliance with test criteria
70 - 2.8.3 Fire performance
70 - 2.8.4 Installation
70 - 2.8.5 Hangers and support systems
71 - 2.8.6 Insulation of flexible ductwork
74 - SECTION 3 EXTERNAL EQUIPMENT INSTALLATION
74 - 3.1 GENERAL
74 - 3.2 ROOF PENETRATIONS
74 - 3.3 CONNECTION TO EQUIPMENT
74 - 3.4 SEALING OF EXTERNAL DUCTWORK
79 - SECTION 4 FUNCTIONAL CRITERIA
79 - 4.1 DEFLECTION
79 - 4.1.1 Sheet
79 - 4.1.2 Reinforcing
79 - 4.1.3 Seams
79 - 4.1.4 Joints
79 - 4.1.5 Beam strength of duct section
79 - 4.2 MODELS FOR FUNCTIONAL STANDARDS
81 - APPENDIX A - PROCEDURE FOR RATING DUCT CONSTRUCTION METHODS RELATIVE TO THE CONSTRUCTION TABLES
81 - A1 PROCEDURES
82 - A2 DEPENDENT VARIABLES
82 - A2.1 Relationships
82 - A2.2 Deflection limits for rectangular duct
83 - APPENDIX B - `J' AND `I' REINFORCEMENT RELATED TO `EI' VALUES
84 - APPENDIX C - ALLOWABLE LOADS FOR TRAPEZE ANGLES
86 - APPENDIX D - CIRCULAR EQUIVALENT OF RECTANGULAR DUCTS
87 - APPENDIX E - WEIGHTS AND AREAS OF RECTANGULAR GALVANIZED STEEL DUCTS
88 - APPENDIX F - WEIGHTS AND AREAS OF CIRCULAR GALVANIZED STEEL DUCTS