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It covers gauge versus absolute pressure, definitions of static and velocity pressure, and how duct pressure is used for fan selection. The document further outlines duct principles including components, classifications, shapes, sizing methods, pressure-loss concepts, fan sizing and balancing, and system elements from supply and return ductwork to fittings and terminal units.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/hvac-how-to-size-and-design-ducts-m06-032-663221/663221/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/hvac-how-to-size-and-design-ducts-m06-032-663221/663221.png","ImageObject",300,407,{"name":92,"@type":93},"Well Done","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-28",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the purpose of properly designed HVAC ductwork?","Question",{"text":112,"@type":113},"Proper duct design and installation deliver maximum interior comfort at lower operating cost while preserving indoor air quality. It also helps avoid discomfort, high energy costs, poor air quality, and excessive noise.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How are air volume, velocity, and duct area related in the course?",{"text":117,"@type":113},"The document states that air volume in cfm can be calculated by multiplying velocity (fpm) by duct cross-sectional area in square feet. It also provides rearranged forms: fpm = cfm/area and Area = cfm/fpm.",{"name":119,"@type":110,"acceptedAnswer":120},"What is the difference between gauge pressure and absolute pressure?",{"text":121,"@type":113},"Gauge pressure is what the gauge indicates, while absolute pressure equals gauge pressure plus atmospheric pressure. The course gives the general equation: Gauge pressure + atmospheric pressure = absolute pressure and illustrates it with 10 psig to 24.7 psia.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},663221,1793225853,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":129,"read_time":144},5909892210082,"https://ap-avatar.wpscdn.com/avatar/56001069da27c9f41e8?x-image-process=image/resize,m_fixed,w_180,h_180&k=1789614185077863061","| |\n| --- |\n| HVAC – How to Size and Design Ducts\u003Cbr>Course No: M06-032\u003Cbr>Credit: 6 PDH |\n| \u003Cbr>A. Bhatia |\n| \u003Cbr>\u003Cbr>Continuing Education and Development, Inc.\u003Cbr>P: (877) 322-5800\u003Cbr>[info@cedengineering.ca](info@cedengineering.ca) |\n\nHVAC – How to Size and Design Ducts – M06-032  \nHVAC  \nHOW TO SIZE AND DESIGN DUCTS  \nHVAC – How to Size and Design Ducts – M06-032  \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| --- | --- |\n| 2.0. | DUCT COMPONENTS & MATERIALS\u003Cbr>2.1 Duct Components\u003Cbr>2.2 Duct Materials |\n| 3.0. | DUCT CLASSIFICATION |\n| 4.0. | 3.1 Velocity Classification\u003Cbr>3.2 Pressure classification\u003Cbr>3.3 Velocity classification v/s Pressure classification\u003Cbr>DUCT SHAPES |\n| 5.0. | 4.1 Round Ducts\u003Cbr>4.2 Rectangular Ducts\u003Cbr>4.3 Oval Ducts\u003Cbr>4.4 Equivalent Diameter\u003Cbr>DUCT SIZING |\n| 6.0. | 5.1 Equal friction method\u003Cbr>5.2 Velocity Reduction Method\u003Cbr>5.3 Static Regain Method\u003Cbr>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\ni  \nHVAC – How to Size and Design Ducts – M06-032  \n\n| 7.0. | 6.4 Pressure Loss across Components\u003Cbr>FAN SIZING |\n| --- | --- |\n| 8.0. | 7.1 Fan Selection Example\u003Cbr>7.2 Balancing Air\u003Cbr>7.3 Fan System Effect\u003Cbr>THE SUPPLY DUCT SYSTEM |\n| 9.0. | 8.1 Extended Plenum Systems\u003Cbr>8.2 Reducing Plenum System\u003Cbr>8.3 Reducing Trunk System\u003Cbr>8.4 Spider System\u003Cbr>8.5 Radial System\u003Cbr>8.6 Perimeter Loop System\u003Cbr>8.7 Rules of Duct Design (ACCA Manual D – Residential Duct Systems)\u003Cbr>RETURN DUCT SYSTEMS |\n| 10.0. | 9.1 Distributed Return\u003Cbr>9.2 Central Return\u003Cbr>9.3 Pressure Balancing\u003Cbr>DUCT FITTINGS AND TERMINAL UNITS\u003Cbr>10.1 Duct Fittings and Transitions\u003Cbr>10.2 Volume Control Dampers\u003Cbr>10.3 Fire and Smoke Dampers\u003Cbr>10.4 Diffusers, Grilles & Registers\u003Cbr>10.5 Location of Air Inlets and Outlets |\n| 11.0. | DUCT CONSTRUCTION & REINFORCEMENT\u003Cbr>11.1 Duct Construction\u003Cbr>11.2 Duct Sheet Metal Thickness |\n\nii  \nHVAC – How to Size and Design Ducts – M06-032  \n\n| 12.0. | 11.3 Aspect Ratio\u003Cbr>11.4 Standard Duct Sizes\u003Cbr>11.5 Duct Fabrication and Lengths 11.6 Duct Hanger Spacing\u003Cbr>GOOD ENGINEERING PRACTICES |\n| --- | --- |\n| 13.0. | 12.1 Energy Conservation\u003Cbr>12.2 Good Engineering Practices for Designing Ductwork\u003Cbr>DUCTWORK INSULATION AND SEALING |\n| 14.0. | 13.1 Ductwork Insulation\u003Cbr>13.2 Ductwork Air Leakage\u003Cbr>13.3 Duct Leakage Tests\u003Cbr>13.4 Duct Sealing\u003Cbr>DUCT ATTENUATION AND NOISE CONSIDERATIONS\u003Cbr>14.1 HVAC Noise Points |\n| 15.0. | 14.2 Acoustical Analysis of a Ductwork System\u003Cbr>DUCTWORK TESTING & SYSTEM PERFORMANCE |\n| 16.0. | 15.1 Balancing the System\u003Cbr>15.2 Testing Methods and Equipment\u003Cbr>15.3 Air Flow Measurement Instruments\u003Cbr>15.4 Determining Air Flow at Grilles\u003Cbr>15.5 Determining Air Flow in Ducts\u003Cbr>15.6 Provisions during Design for Testing, Adjusting, and Balancing\u003Cbr>DUCT CLEANING\u003Cbr>16.1 Duct Cleaning Methods\u003Cbr>16.2 Coordination between Design Specialties |\n\niii  \nHVAC – How to Size and Design Ducts – M06-032  \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 space.  \n3. It should not transmit or generate objectionable noise.  \nA primary ","cbCaie6yIz8TOOkt","https://ap.wps.com/l/cbCaie6yIz8TOOkt","pdf",4308558,91,"English","# 1. DUCTWORK DESIGN PRINCIPLES\n## 1.1 Basic Definitions\n## 1.2 Air Flow Principles\n## 1.3 Total Pressure, Velocity Pressure, and Static Pressure\n## 1.4 Air Flow Characteristics in Duct\n# 2. DUCT COMPONENTS & MATERIALS\n# 3. DUCT CLASSIFICATION\n# 4. DUCT SHAPES\n# 5. DUCT SIZING\n# 6. PRESSURE LOSSES IN AIR DISTRIBUTION SYSTEM\n# 7. FAN SIZING\n# 8. THE SUPPLY DUCT SYSTEM\n# 9. RETURN DUCT SYSTEMS\n# 10. DUCT FITTINGS AND TERMINAL UNITS\n# 11. DUCT CONSTRUCTION & REINFORCEMENT\n# 12. GOOD ENGINEERING PRACTICES\n# 13. DUCTWORK INSULATION AND SEALING\n# 14. DUCT ATTENUATION AND NOISE CONSIDERATIONS\n# 15. DUCTWORK TESTING & SYSTEM PERFORMANCE\n# 16. DUCT CLEANING","[{\"question\":\"What is the purpose of properly designed HVAC ductwork?\",\"answer\":\"Proper duct design and installation deliver maximum interior comfort at lower operating cost while preserving indoor air quality. It also helps avoid discomfort, high energy costs, poor air quality, and excessive noise.\"},{\"question\":\"How are air volume, velocity, and duct area related in the course?\",\"answer\":\"The document states that air volume in cfm can be calculated by multiplying velocity (fpm) by duct cross-sectional area in square feet. It also provides rearranged forms: fpm = cfm/area and Area = cfm/fpm.\"},{\"question\":\"What is the difference between gauge pressure and absolute pressure?\",\"answer\":\"Gauge pressure is what the gauge indicates, while absolute pressure equals gauge pressure plus atmospheric pressure. The course gives the general equation: Gauge pressure + atmospheric pressure = absolute pressure and illustrates it with 10 psig to 24.7 psia.\"}]","HVAC - How to Size and Design Ducts - M06-032 | PDF",229]