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Poor design leads to discomfort, high energy costs, bad air quality, and increased noise levels.","Answer",{"name":114,"@type":109,"acceptedAnswer":115},"What are the main requirements of an air conditioning duct system?",{"text":116,"@type":112},"It should deliver specified air-flow rates to prescribed locations, be economical across initial cost, fan operating cost, and building space, and avoid objectionable noise transmission or generation.",{"name":118,"@type":109,"acceptedAnswer":119},"How does gauge pressure relate to absolute pressure in duct design?",{"text":120,"@type":112},"Gauge pressure is what the gauge indicates, while absolute pressure equals gauge pressure plus atmospheric pressure. For example, 10 psig corresponds to 24.7 psia using 10 psig + 14.7 psi = 24.7 psia.","https://schema.org",{"og:url":83,"og:type":123,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":125,"canonical":83},"index,follow",{"doc_id":127,"site_id":62},674263,1793759011,{"code":4,"msg":5,"data":130},{"doc_id":127,"user_id":131,"nickname":92,"user_avatar":132,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":133,"file_id":134,"file_url":135,"file_type":136,"file_size":137,"view_count":8,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":138,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":128,"read_time":143},1374402739827,"https://ap-avatar.wpscdn.com/avatar/14000c97e7351f1a627?x-image-process=image/resize,m_fixed,w_180,h_180&k=1787885694763230660","| |\n| --- |\n| HVAC – How to Size and Design Ducts\u003Cbr>Course No: M06-048\u003Cbr>Credit: 6 PDH |\n| \u003Cbr>A. Bhatia |\n| \u003Cbr>\u003Cbr>Continuing Education and Development, Inc.\u003Cbr>P: (877) 322-5800\u003Cbr>[info@cedengineering.com](info@cedengineering.com) |\n| [www.cedengineering.com](www.cedengineering.com) |\n\nHVAC – How to Size and Design Ducts – M06-048  \nHVAC  \nHOW TO SIZE AND DESIGN DUCTS  \n|  | HVAC – How to Size and Design Ducts – M06-048 |\n| --- | --- |\n| 1.0. | CONTENTS\u003Cbr>DUCTWORK DESIGN PRINCIPLES\u003Cbr>1.1 Basic Definitions\u003Cbr>1.2 Air Flow Principles\u003Cbr>1.3 Total Pressure, Velocity Pressure, and Static Pressure\u003Cbr>1.4 Air Flow Characteristics in Duct |\n| 2.0. | DUCT COMPONENTS & MATERIALS |\n| 3.0. | 2.1 Duct Components\u003Cbr>2.2 Duct Materials DUCT CLASSIFICATION\u003Cbr>3.1 Velocity Classification\u003Cbr>3.2 Pressure classification\u003Cbr>3.3 Velocity classification v/s Pressure classification |\n| 4.0. | DUCT SHAPES |\n| 5.0. | 4.1 Round Ducts\u003Cbr>4.2 Rectangular Ducts\u003Cbr>4.3 Oval Ducts\u003Cbr>4.4 Equivalent Diameter DUCT SIZING\u003Cbr>5.1 Equal friction method\u003Cbr>5.2 Velocity Reduction Method\u003Cbr>5.3 Static Regain Method |\n| 6.0. | PRESSURE LOSSES IN AIR DISTRIBUTION SYSTEM\u003Cbr>6.1 Duct Friction Losses\u003Cbr>6.2 Duct Fitting Dynamic Losses\u003Cbr>6.3 The Concept of Duct Equivalent Length |\n|  | i |\n\n\n| HVAC – How to Size and Design Ducts – M06-048 |\n| --- |\n| 6.4 Pressure Loss across Components |\n| 7.0. FAN SIZING |\n| 7.1 Fan Selection Example |\n| 7.2 Balancing Air |\n| 7.3 Fan System Effect |\n| 8.0. THE SUPPLY DUCT SYSTEM |\n| 8.1 Extended Plenum Systems |\n| 8.2 Reducing Plenum System |\n| 8.3 Reducing Trunk System |\n| 8.4 Spider System |\n| 8.5 Radial System |\n| 8.6 Perimeter Loop System |\n| 8.7 Rules of Duct Design (ACCA Manual D – Residential Duct Systems) |\n| 9.0. RETURN DUCT SYSTEMS |\n| 9.1 Distributed Return |\n| 9.2 Central Return |\n| 9.3 Pressure Balancing |\n| 10.0. DUCT FITTINGS AND TERMINAL UNITS |\n| 10.1 Duct Fittings and Transitions |\n| 10.2 Volume Control Dampers |\n| 10.3 Fire and Smoke Dampers |\n| 10.4 Diffusers, Grilles & Registers |\n| 10.5 Location of Air Inlets and Outlets |\n| 11.0. DUCT CONSTRUCTION & REINFORCEMENT |\n| 11.1 Duct Construction |\n| 11.2 Duct Sheet Metal Thickness |\n| ii |\n\n\n| HVAC – How to Size and Design Ducts – M06-048 |\n| --- |\n| 11.3 Aspect Ratio |\n| 11.4 Standard Duct Sizes |\n| 11.5 Duct Fabrication and Lengths |\n| 11.6 Duct Hanger Spacing |\n| 12.0. GOOD ENGINEERING PRACTICES |\n| 12.1 Energy Conservation |\n| 12.2 Good Engineering Practices for Designing Ductwork |\n| 13.0. DUCTWORK INSULATION AND SEALING |\n| 13.1 Ductwork Insulation |\n| 13.2 Ductwork Air Leakage |\n| 13.3 Duct Leakage Tests |\n| 13.4 Duct Sealing |\n| 14.0. DUCT ATTENUATION AND NOISE CONSIDERATIONS |\n| 14.1 HVAC Noise Points |\n| 14.2 Acoustical Analysis of a Ductwork System |\n| 15.0. DUCTWORK TESTING & SYSTEM PERFORMANCE |\n| 15.1 Balancing the System |\n| 15.2 Testing Methods and Equipment |\n| 15.3 Air Flow Measurement Instruments |\n| 15.4 Determining Air Flow at Grilles |\n| 15.5 Determining Air Flow in Ducts |\n| 15.6 Provisions during Design for Testing, Adjusting, and Balancing |\n| 16.0. DUCT CLEANING |\n| 16.1 Duct Cleaning Methods |\n| 16.2 Coordination between Design Specialties |\n| iii |\n\nHVAC – How to Size and Design Ducts – M06-048  \nHVAC – HOW TO SIZE AND DESIGN DUCTS  \nAir flow problems have plagued the HVAC industry for years. No matter how much money you spend on a high-quality HVAC system, the equipment won’t work at its best without properly designed and installed ductwork. Ducts that are not well designed result in discomfort, high energy costs, bad air quality, and increased noise levels.  \nA well-designed ductwork system should deliver maximum interior comfort at the lowest operating cost while also preserving indoor air quality. The chief requirements of an air conditioning duct system are:  \n1. It should convey specified rates of air flow to prescribed locations.  \n2. It should be economical in combined initial cost, fan operating cost and cost of building sp","cbCaii4y0NNZ0OOR","https://ap.wps.com/l/cbCaii4y0NNZ0OOR","pdf",5311161,91,"English","# Ductwork Design Principles\n## Basic Definitions\n## Air Flow Principles\n## Total Pressure, Velocity Pressure, and Static Pressure\n## Air Flow Characteristics in Duct\n# Duct Components & Materials\n# Duct Classification\n## Velocity Classification\n## Pressure classification\n## Velocity classification v/s Pressure classification\n# Duct Shapes\n## Round Ducts\n## Rectangular Ducts\n## Oval Ducts\n## Equivalent Diameter\n# Duct Sizing\n## Equal friction method\n## Velocity Reduction Method\n## Static Regain Method\n# Pressure Losses in Air Distribution System\n## Duct Friction Losses\n## Duct Fitting Dynamic Losses\n## The Concept of Duct Equivalent Length\n## Pressure Loss across Components\n# Fan Sizing\n## Fan Selection Example\n## Balancing Air\n## Fan System Effect\n# Supply Duct System\n## Extended Plenum Systems\n## Reducing Plenum System\n## Reducing Trunk System\n## Spider System\n## Radial System\n## Perimeter Loop System\n## Rules of Duct Design (ACCA Manual D – Residential Duct Systems)\n# Return Duct Systems\n## Distributed Return\n## Central Return\n## Pressure Balancing\n# Duct Fittings and Terminal Units\n## Duct Fittings and Transitions\n## Volume Control Dampers\n## Fire and Smoke Dampers\n## Diffusers, Grilles & Registers\n## Location of Air Inlets and Outlets\n# Duct Construction & Reinforcement\n## Duct Construction\n## Duct Sheet Metal Thickness\n## Aspect Ratio\n## Standard Duct Sizes\n## Duct Fabrication and Lengths\n## Duct Hanger Spacing\n# Good Engineering Practices\n## Energy Conservation\n## Good Engineering Practices for Designing Ductwork\n# Ductwork Insulation and Sealing\n## Ductwork Insulation\n## Ductwork Air Leakage\n## Duct Leakage Tests\n## Duct Sealing\n# Duct Attenuation and Noise Considerations\n## HVAC Noise Points\n## Acoustical Analysis of a Ductwork System\n# Ductwork Testing & System Performance\n## Balancing the System\n## Testing Methods and Equipment\n## Air Flow Measurement Instruments\n## Determining Air Flow at Grilles\n## Determining Air Flow in Ducts\n## Provisions during Design for Testing, Adjusting, and Balancing\n# Duct Cleaning\n## Duct Cleaning Methods\n## Coordination between Design Specialties","[{\"question\":\"Why is properly designed ductwork important in HVAC systems?\",\"answer\":\"Ductwork must be designed and installed to perform at its best. Poor design leads to discomfort, high energy costs, bad air quality, and increased noise levels.\"},{\"question\":\"What are the main requirements of an air conditioning duct system?\",\"answer\":\"It should deliver specified air-flow rates to prescribed locations, be economical across initial cost, fan operating cost, and building space, and avoid objectionable noise transmission or generation.\"},{\"question\":\"How does gauge pressure relate to absolute pressure in duct design?\",\"answer\":\"Gauge pressure is what the gauge indicates, while absolute pressure equals gauge pressure plus atmospheric pressure. For example, 10 psig corresponds to 24.7 psia using 10 psig + 14.7 psi = 24.7 psia.\"}]","HVAC - How to Size and Design Ducts - Course M06-048 | PDF",229]