[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-1-en-105":3,"doc-seo-571186-105":53,"doc-detail-571186-en":126},{"code":4,"msg":5,"data":6},0,"success",[7,14,19,24,29,34,39,44,49],{"id":8,"doc_module":9,"doc_module_name":10,"category_name":11,"show_sort_weight":12,"slug":13},11,1,"Template","Presentations",90,"presentations",{"id":15,"doc_module":9,"doc_module_name":10,"category_name":16,"show_sort_weight":17,"slug":18},12,"Resumes",80,"resumes",{"id":20,"doc_module":9,"doc_module_name":10,"category_name":21,"show_sort_weight":22,"slug":23},14,"Invoices",70,"invoices",{"id":25,"doc_module":9,"doc_module_name":10,"category_name":26,"show_sort_weight":27,"slug":28},15,"Posters",60,"posters",{"id":30,"doc_module":9,"doc_module_name":10,"category_name":31,"show_sort_weight":32,"slug":33},16,"Social Media",50,"social-media",{"id":35,"doc_module":9,"doc_module_name":10,"category_name":36,"show_sort_weight":37,"slug":38},17,"Forms",40,"forms",{"id":40,"doc_module":9,"doc_module_name":10,"category_name":41,"show_sort_weight":42,"slug":43},18,"Letters",30,"letters",{"id":45,"doc_module":9,"doc_module_name":10,"category_name":46,"show_sort_weight":47,"slug":48},21,"Paper Templates",5,"papers-templates",{"id":50,"doc_module":9,"doc_module_name":10,"category_name":51,"show_sort_weight":4,"slug":52},158,"General","general-158",{"code":4,"msg":54,"data":55},"ok",{"site_id":56,"language":57,"slug":58,"title":59,"keywords":60,"description":61,"schema_data":62,"social_meta":119,"head_meta":121,"extra_data":123,"updated_unix":125},105,"en","duct-diameter-sizing-charts","Duct Diameter Sizing Charts","","Duct Diameter Sizing Charts provide a method to determine HVAC duct diameter using CFM and Velocity, using the relationship CFM / V = AREA. Each chart lists required duct diameters for given airflow and velocity combinations, tied to specific fan names, curb sizes, and duct transition part numbers. Guidance emphasizes sizing ducts to the fan inlet and curb and warns that under-sizing or over-sizing can affect system performance or interfere with the curb. Transition plates are oversized for alignment tolerance and are cut to size in the field; the highlighted yellow area indicates the duct diameter(s) selected per the fan chart.",{"@graph":63,"@context":118},[64,80,101],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":46,"@type":70,"position":76},"https://docshare.wps.com/template/paper-templates/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/duct-diameter-sizing-charts/571186/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/duct-diameter-sizing-charts/571186.png","ImageObject",442,249,{"name":88,"@type":89},"percent12345","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-10-15","2026-10-13",true,{"@type":98,"interactionType":99,"userInteractionCount":9},"InteractionCounter",{"@type":100},"ViewAction",{"@type":102,"mainEntity":103},"FAQPage",[104,110,114],{"name":105,"@type":106,"acceptedAnswer":107},"How is duct diameter determined from the charts?","Question",{"text":108,"@type":109},"Select the chart corresponding to the fan(s), curb size, and transition plate part numbers, then match the required CFM and Velocity values to read the duct diameter(s).","Answer",{"name":111,"@type":106,"acceptedAnswer":112},"What does the relationship CFM / V = AREA mean in sizing?",{"text":113,"@type":109},"It expresses how airflow (CFM) and air velocity combine to determine the required duct cross-sectional area, which the charts then convert into duct diameter selections.",{"name":115,"@type":106,"acceptedAnswer":116},"Why should the duct be sized correctly for the fan inlet and curb?",{"text":117,"@type":109},"The document notes that under-sizing or over-sizing the duct can cause system effect changes and may interfere with the curb.","https://schema.org",{"og:url":78,"og:type":120,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":122,"canonical":78},"index,follow",{"doc_id":124,"site_id":56},571186,1792062968,{"code":4,"msg":5,"data":127},{"doc_id":124,"user_id":128,"nickname":88,"user_avatar":129,"doc_module":9,"category_id":45,"category_name":46,"doc_title":59,"doc_description":61,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":9,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":135,"language":136,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":61,"update_tm":140,"read_time":76},1099529851338,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Duct Diameter Sizing Charts  \nThe following is needed to determine the duct diameter: CFM and Velocity (CFM / V = AREA) . Charts listed below show what duct diameter to use given a CFM and Velocity. Title information for each block identifies the name of the fan(s) , the curb size and the duct transition part number(s) needed to transition from the listed duct to the curb. Duct is sized to the fan inlet and curb, under-sizing or over-sizing duct will cause system effect and or interfere with the curb. Transition plates are oversized to allow for slight misalignments in duct, transition plates are cut to size in the field. Note: the yellow highlighted area in each chart identifies the specific duct diameter(s) to be used per the charts titled fan.  \n\n| DU12HFA-Curb 17 1/2\" -Transition Plates DW1710TP & DW1712TP |  |  |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- |\n|  | Velocity |  |  |  |  |  |  |\n| CFM | 1200 | 1300 | 1400 | 1500 | 1600 | 1700 | 1800 |\n| 500 | 10 | 10 | 10 | 8 | 8 | 8 | 8 |\n| 600 | 10 | 10 | 10 | 10 | 10 | 10 | 8 |\n| 700 | 12 | 10 | 10 | 10 | 10 | 10 | 10 |\n| 800 | 12 | 12 | 12 | 10 | 10 | 10 | 10 |\n| 900 | 12 | 12 | 12 | 12 | 12 | 10 | 10 |\n| 1000 | 14 | 12 | 12 | 12 | 12 | 12 | 12 |\n| 1100 | 14 | 14 | 14 | 12 | 12 | 12 | 12 |\n| 1200 | 14 | 14 | 14 | 14 | 12 | 12 | 12 |\n| 1300 | 16 | 14 | 14 | 14 | 14 | 12 | 12 |\n| 1400 | 16 | 16 | 14 | 14 | 14 | 14 | 12 |\n\n\n| NCA08FA – NCA10FA-DU25HFA, DU30HFA, DU33HFA, DU50HFA-Curb 19 1/2\" -Transition Plates DW1912TP & DW1914TP |  |  |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- |\n|  | Velocity |  |  |  |  |  |  |\n| CFM | 1200 | 1300 | 1400 | 1500 | 1600 | 1700 | 1800 |\n| 700 | 12 | 10 | 10 | 10 | 10 | 10 | 10 |\n| 800 | 12 | 12 | 12 | 10 | 10 | 10 | 10 |\n| 900 | 12 | 12 | 12 | 12 | 12 | 10 | 10 |\n| 1000 | 14 | 12 | 12 | 12 | 12 | 12 | 12 |\n| 1100 | 14 | 14 | 14 | 12 | 12 | 12 | 12 |\n| 1200 | 14 | 14 | 14 | 14 | 12 | 12 | 12 |\n| 1300 | 16 | 14 | 14 | 14 | 14 | 12 | 12 |\n| 1400 | 16 | 16 | 14 | 14 | 14 | 14 | 12 |\n| 1500 | 16 | 16 | 16 | 14 | 14 | 14 | 14 |\n| 1600 | 16 | 16 | 16 | 14 | 14 | 14 | 14 |\n| 1700 | 18 | 16 | 16 | 16 | 14 | 14 | 14 |\n| 1800 | 18 | 16 | 16 | 16 | 16 | 14 | 14 |\n| 1900 | 18 | 18 | 16 | 16 | 16 | 16 | 14 |\n\nDuct Diameter Sizing Chart  \n\n| NCA14FA-NCA14HPFA-DU75HFA-DU85HFA-Curb 23\" -Transition Plates DW2314TP,\u003Cbr>DW2316TP & DW2318TP |  |  |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- |\n|  | Velocity |  |  |  |  |  |  |\n| CFM | 1200 | 1300 | 1400 | 1500 | 1600 | 1700 | 1800 |\n| 1000 | 14 | 12 | 12 | 12 | 12 | 12 | 12 |\n| 1100 | 14 | 14 | 14 | 12 | 12 | 12 | 12 |\n| 1200 | 14 | 14 | 14 | 14 | 12 | 12 | 12 |\n| 1300 | 16 | 14 | 14 | 14 | 14 | 12 | 12 |\n| 1400 | 16 | 16 | 14 | 14 | 14 | 14 | 12 |\n| 1500 | 16 | 16 | 16 | 14 | 14 | 14 | 14 |\n| 1600 | 16 | 16 | 16 | 14 | 14 | 14 | 14 |\n| 1700 | 18 | 16 | 16 | 16 | 14 | 14 | 14 |\n| 1800 | 18 | 16 | 16 | 16 | 16 | 14 | 14 |\n| 1900 | 18 | 18 | 16 | 16 | 16 | 16 | 14 |\n| 2000 | 18 | 18 | 18 | 16 | 16 | 16 | 16 |\n| 2100 | 18 | 18 | 18 | 18 | 16 | 16 | 16 |\n| 2200 | 20 | 18 | 18 | 18 | 16 | 16 | 16 |\n| 2300 | 20 | 20 | 18 | 18 | 18 | 16 | 16 |\n| 2400 | 20 | 20 | 18 | 18 | 18 | 18 | 16 |\n| 2500 | 20 | 20 | 20 | 18 | 18 | 18 | 16 |\n| 2600 | 20 | 20 | 20 | 18 | 18 | 18 | 18 |\n| 2700 | 24 | 20 | 20 | 20 | 18 | 18 | 18 |\n| 2800 | 24 | 20 | 20 | 20 | 18 | 18 | 18 |\n| 2900 | 24 | 24 | 20 | 20 | 20 | 18 | 18 |\n| 3000 | 24 | 24 | 20 | 20 | 20 | 18 | 18 |\n| 3100 | 24 | 24 | 24 | 20 | 20 | 20 | 18 |\n\nDuct Diameter Sizing Chart  \n\n| NCA16FA-NCA16HPFA – NCA18FA – NCA18HPFA-Curb 26 1/2\" -Transition Plates\u003Cbr>DW2616TP, DW2618TP & DW2620TP |  |  |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- |\n|  | Velocity |  |  |  |  |  |  |\n| CFM | 1200 | 1300 | 1400 | 1500 | 1600 | 1700 | 1800 |\n| 1300 | 16 | 14 | 14 | 14 | 14 | 12 | 12 |\n| 1400 | 16 | 16 | 14 | 14 | 14 | 14 | 12 |\n| 1500 | 16 | 16 | 16 | 14 | 14 | 14 | 14 |\n| 1600 | 16 | 16 | 16 | 14 | 14 | 14 | 14 |\n| 17","cbCaivK7L7PAq6ie","https://ap.wps.com/l/cbCaivK7L7PAq6ie","pdf",85378,8,"English","# Duct Diameter Sizing Charts\n## Sizing method and notes\n## Chart tables by fan/curb and transition plates","[{\"question\":\"How is duct diameter determined from the charts?\",\"answer\":\"Select the chart corresponding to the fan(s), curb size, and transition plate part numbers, then match the required CFM and Velocity values to read the duct diameter(s).\"},{\"question\":\"What does the relationship CFM / V = AREA mean in sizing?\",\"answer\":\"It expresses how airflow (CFM) and air velocity combine to determine the required duct cross-sectional area, which the charts then convert into duct diameter selections.\"},{\"question\":\"Why should the duct be sized correctly for the fan inlet and curb?\",\"answer\":\"The document notes that under-sizing or over-sizing the duct can cause system effect changes and may interfere with the curb.\"}]","Duct Diameter Sizing Charts | PDF",1791901704]