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HVAC Duct Systems Inspection Guide, 3rd Edition, 2006

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FOREWORD
FORMER TASK FORCE MEMBERS AND OTHER CONTRIBUTORS
NOTICE TO USERS OF THIS PUBLICATION
TABLE OF CONTENTS
CHAPTER 1 SCOPE [Go to Page]
1.1 SCOPE
1.2 WHAT IS THE PURPOSE OF INSPECTION?
1.3 WHAT IS THE VALUE OF INSPECTION?
1.4 WHAT IS THE COST OF INSPECTION?
1.5 DOES THE TIMING OF INSPECTIONS AFFECT CONSTRUCTION COSTS?
1.6 WHAT RISKS ARE INVOLVED WHEN INSPECTIONS ARE NOT DONE OR ARE NOT DONE PROPERLY?
1.7 WHAT QUALIFICATIONS ARE NEEDED BY INSPECTORS?
1.8 HOW DO I USE THIS GUIDE?
1.9 DUCT INSPECTIONS OVERVIEW
CHAPTER 2 COMPLIANCE AND QUALITY CONTROL [Go to Page]
2.1 COMPLIANCE AND QUALITY CONTROL
2.2 CHECKLISTS
APPENDIX A FUNCTIONS OF DUCTED AIR HANDLING SYSTEMS [Go to Page]
A.1 VENTILATION AND AIR CONDITIONING
A.2 CENTRAL AIR HANDLING SYSTEM
A.3 DEDICATED EXHAUST SYSTEMS
A.4 ROOM AIR DISTRIBUTION
A.5 ROOM PRESSURE CONTROL
A.6 INFILTRATION AND EXFILTRATION
A.7 CENTRAL ALARM CONTROL STATIONS
A.8 TESTING AND BALANCING
A.9 SYMBOLS
FIGURE A-1 SYMBOLS FOR HVAC SYSTEMS
FIGURE A-1M SYMBOLS FOR HVAC SYSTEMS (METRIC)
FIGURE A-2 SINGLE DUCT SYSTEM
FIGURE A-3 TERMINAL REHEAT SYSTEM
FIGURE A-4 MULTI-ZONE SYSTEM
FIGURE A-5 VARIABLE VOLUME SYSTEM
FIGURE A-6 DUCT SYSTEM EXAMPLE
FIGURE A-6M DUCT SYSTEM EXAMPLE (METRIC)
FIGURE A-7 DUCT PRESSURE CLASS DESIGNATION
APPENDIX B DUCT CONSTRUCTION MATERIALS [Go to Page]
B.1 GALVANIZED STEEL
B.2 CARBON STEEL (BLACK IRON)
B.3 STAINLESS STEEL
B.4 ALUMINUM
B.5 COPPER
B.6 FIBERGLASS REINFORCED PLASTIC (FRP)
B.7 POLYVINYL CHLORIDE (PVC)
B.8 POLYVINYL STEEL (PVS)
B.9 CONCRETE
B.10 ASBESTOS CEMENT
B.11 RIGID FIBROUS GLASS
B.12 GYPSUM BOARD
Table B-1 Galvanized Sheet Thickness Tolerances
Table B-2 Manufacturers Standard Gage-Thickness (Uncoated Steel)
Table B-3 Stainless Steel Sheet Thickness
Table B-4 Aluminum Sheet Thickness (Alloy 3003-H14))
APPENDIX C HVAC DUCT CONSTRUCTION STANDARDS [Go to Page]
C.1 DUCT CONSTRUCTION AND INSTALLATION STANDARDS
C.2 DUCT SEALING COMMENTARY
C.3 RECTANGULAR DUCT REINFORCEMENT
C.4 INTRODUCTION TO THE RECTANGULAR DUCT CONSTRUCTION SCHEDULES
C.5 TRANSVERSE JOINTS FOR RECTANGULAR DUCT
C.6 VOLUME DAMPERS (NOTES FOR FIGURES C-15 AND C-16)
C.7 COMMENTARY
C.8 SPECIFICATION FOR SUPPORTING FLEXIBLE DUCT
C.9 ROUND DUCT CONSTRUCTION STANDARDS
C.10 COMMENTARY
C.11 CASING AND PLENUM CONSTRUCTION STANDARDS
Table C-1 Standard Duct Sealing Requirements
Table C-2 Rectangular Duct Reinforcement
Table C-2M Rectangular Duct Reinforcement
Table C-3 Unreinforced Duct (Wall Thickness)
Table C-3M Unreinforced Duct (Wall Thickness)
Table C-4 Intermediate Reinforcement
Table C-4M Intermediate Reinforcement
Table C-5 Transverse Joint Reinforcement
Table C-5M Transverse Joint Reinforcement
Table C-6 Transverse Joint Reinforcement
Table C-6M Transverse Joint Reinforcement
Table C-7 Mitered Elbows
Table C-8 Round Duct Gage Unreinforced Positive Pressure
Table C-8M Round Duct Gage Unreinforced Positive Pressure
Table C-9 Rectangular Duct Hangers Minimum Size
Table C-9M Rectangular Duct Hangers Minimum Size
Table C-10 Minimum Hanger Sizes for Round Duct
FIGURE C-1 DEPENDENT VARIABLES
FIGURE C-2 READING GUIDE SUMMARY
FIGURE C-3 UNREINFORCED DUCT
FIGURE C-4 CROSSBROKEN AND BEADED DUCT
FIGURE C-5 FLEXIBLE DUCT LINER INSTALLATION
FIGURE C-6 LINER FASTENERS
FIGURE C-7 DUCT REINFORCED ON TWO SIDES
FIGURE C-8 REINFORCEMENT ATTACHMENT
FIGURE C-9 RECTANGULAR DUCT/TRANSVERSE JOINTS
FIGURE C-9 RECTANGULAR DUCT/TRANSVERSE JOINTS (CONTINUED)
FIGURE C-9 RECTANGULAR DUCT/TRANSVERSE JOINTS (CONTINUED)
FIGURE C-9 RECTANGULAR DUCT/TRANSVERSE JOINTS (CONTINUED)
FIGURE C-10 RECTANGULAR DUCT/LONGITUDINAL SEAMS
FIGURE C-11 RECTANGULAR ELBOWS
FIGURE C-11 RECTANGULAR ELBOWS (CONTINUED)
FIGURE C-12 VANES AND VANE RUNNERS
FIGURE C-13 VANE SUPPORT IN ELBOWS
FIGURE C-14 BRANCH CONNECTION
FIGURE C-15 VOLUME DAMPERS - SINGLE BLADE TYPE
FIGURE C-16 MULTIBLADE VOLUME DAMPERS
FIGURE C-17 OFFSETS AND TRANSITIONS
FIGURE C-18 REMOTE HEATING AND COOLING COIL INSTALLATIONS
FIGURE C-19 CEILING DIFFUSER BRANCH DUCTS
FIGURE C-20 FLEXIBLE DUCT SUPPORTS
FIGURE C-21 FLEXIBLE DUCT SUPPORTS
FIGURE C-22 ROUND DUCT TRANSVERSE JOINTS
FIGURE C-22 ROUND DUCT TRANSVERSE JOINTS (CONTINUED)
FIGURE C-23 ROUND DUCT LONGITUDINAL SEAMS
FIGURE C-24 HANGER ATTACHMENTS TO STRUCTURES
FIGURE C-25 UPPER ATTACHMENT DEVICES - TYPICAL
FIGURE C-26 LOWER HANGER ATTACHMENTS
FIGURE C-27 RISER SUPPORTS - FROM FLOOR
FIGURE C-27M RISER SUPPORTS - FROM FLOOR
FIGURE C-28 ROOFTOP DUCT INSTALLATION
FIGURE C-29 EQUIPMENT AND DUCT SUPPORT FLASHING
FIGURE C-30 RECTANGULAR GOOSENECK
FIGURE C-31 BUILT-UP STANDING SEAM CASING
FIGURE C-32 DISHWASHER VAPOR EXHAUST
APPENDIX D FIRE, SMOKE, AND RADIATION DAMPER GUIDE [Go to Page]
Table D-1 Recommended Fire Damper Installation Instructions
Table D-2 Recommended Minimum Sleeve Thickness for Fire Dampers*
FIGURE D-1 BASIC FIRE DAMPER INSTALLATION DETAILS
FIGURE D-2 UL DUCT-SLEEVE CONNECTIONS (BREAKAWAY CONNECTIONS)
FIGURE D-2 UL DUCT-SLEEVE CONNECTIONS (BREAKAWAY CONNECTIONS) (CONTINUED)
FIGURE D-3 FIRE DAMPER OPENING PROTECTION
FIGURE D-4 CURTAIN FIRE DAMPERS
FIGURE D-5 COMBINATION FIRE AND SMOKE DAMPERS
FIGURE D-6 DUCT LINER INTERRUPTION
FIGURE D-7 ACCESS DOORS AND PANELS
FIGURE D-8 LEAKAGE RATED (SMOKE) DAMPER
FIGURE D-9 FIRE RATED CEILING ASSEMBLIES
APPENDIX E FIBROUS GLASS DUCT CONSTRUCTION [Go to Page]
E.1 FIBROUS GLASS DUCT CHARACTERISTICS AND LIMITATIONS
E.2 CLOSURES
E.3 ADDITIONAL FIBROUS GLASS DUCT CONSTRUCTION DETAILS
Table E-1 Tie Rod System Reinforcement Schedule
Table E-1M Tie Rod System Reinforcement Schedule
Table E-2 Channel System Reinforcement Schedule
Table E-2M Channel System Reinforcement Schedule
Table E-3 Partial Wrap-around Reinforcement Schedule
Table E-3M Partial Wrap-around Reinforcement Schedule
Table E-4 Maximum Hanger Spacing by Duct Size, I.D.
Table E-5 Channel Selection
FIGURE E-1 TAPE CLOSURE JOINT, WITH STAPLE FLAP
FIGURE E-2 TAPE CLOSURE JOINT, WITHOUT STAPLE FLAP
FIGURE E-3 CLOSURES (CONTINUED)
FIGURE E-4 TIE ROD REINFORCEMENT AT JOINT
FIGURE E-5 SHEET METAL AND EQUIPMENT CONNECTION DETAILS
FIGURE E-6 SHEET METAL AND EQUIPMENT CONNECTION DETAILS (CONTINUED)
FIGURE E-7 TIE ROD REINFORCEMENT
FIGURE E-7M TIE ROD REINFORCEMENT
FIGURE E-8 TIE ROD TERMINATION METHODS
FIGURE E-9 CHANNEL REINFORCEMENT, POSITIVE PRESSURE SYSTEMS
FIGURE E-10 CHANNEL REINFORCEMENT, NEGATIVE PRESSURE SYSTEMS
FIGURE E-11 PARTIAL WRAP-AROUND REINFORCEMENT
FIGURE E-11M PARTIAL WRAP-AROUND REINFORCEMENT
FIGURE E-12 ALLOWABLE HANGER SPACING, STRAIGHT DUCT " 3 INCH WIDE CHANNELS
FIGURE E-13 HANGER SPACING AND EXTENSION " 3 INCH WIDE CHANNELS
FIGURE E-14 USE OF 2 INCH WIDE HANGER CHANNELS
FIGURE E-15 ACCESS DOOR, FLANGE ON OPENING [Go to Page]

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HVAC Duct Systems Inspection Guide, 3rd Edition, 2006