[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-674264-105":59,"doc-detail-674264-en":129},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":122,"head_meta":124,"extra_data":126,"updated_unix":128},105,"en","squer-rectangular-ducts-and-fittings-technical-information","SQUER-Rectangular Ducts and Fittings - Technical Information","","SQUER technical information presents ALNOR’s range of rectangular ventilation ducts and fittings for low- and medium-pressure indoor HVAC systems. It specifies sizing conventions, air-tightness classes, leakage limits and pressure limits, and references EN 1505 and DIN 18379 for measurements. It defines nominal and effective dimensions, standard size ranges, material options including stainless steel and aluminium, and installation design classes for low- and medium-pressure operation. Dimensional tolerances, minimum sheet thickness, and certification/hygiene markings are provided.",{"@graph":69,"@context":121},[70,84,104],{"@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/squer-rectangular-ducts-and-fittings-technical-information/674264/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":98,"encodingFormat":97,"isAccessibleForFree":99,"interactionStatistic":100},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/squer-rectangular-ducts-and-fittings-technical-information/674264.png","ImageObject",300,407,{"name":92,"@type":93},"Chumphorn","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-04",true,{"@type":101,"interactionType":102,"userInteractionCount":8},"InteractionCounter",{"@type":103},"ViewAction",{"@type":105,"mainEntity":106},"FAQPage",[107,113,117],{"name":108,"@type":109,"acceptedAnswer":110},"What standards are used to size and evaluate the rectangular ducts and fittings?","Question",{"text":111,"@type":112},"Sizing and dimensions follow EN 1505:2001, and surface area measurement follows DIN 18379. Requirements for strength and leakage reference EN 1507, and tightness class definitions cite PN-B-76001.","Answer",{"name":114,"@type":109,"acceptedAnswer":115},"How are nominal dimensions and effective lengths defined for ducts and fittings?",{"text":116,"@type":112},"Nominal size is the internal side dimensions a and b, with side a visible, and adapter sides c and d where side c is visible. Effective length L is the added length for straight ducts, while effective length l is added for fittings.",{"name":118,"@type":109,"acceptedAnswer":119},"What air-tightness classes and leakage limit approach are specified?",{"text":120,"@type":112},"Air tightness is provided in classes A and B for standard and improved airtightness design versions. The document lists leakage rate limit values (fmax) per class along with corresponding static pressure limit values and vacuum/overpressure ranges.","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},674264,1793759011,{"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},2336475401981,"https://ap-avatar.wpscdn.com/avatar/22000c94efd8d5204d?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786935347598174694","Download Wentyle Download AlnorCAMB2B ordering  \nRectangular ducts and fittings  \nALNOR reserves the right to modify technical specificationsin line with the policy of continuous product improvement.  \nALNOR® ventilation systems  \nis a registered trademark protected by a technical patent. All modification rights reserved.  \n967  \nRectangular ducts and fittings  \n968  \nSQUER  \nTECHNICAL INFORMATION  \nSystem description  \nThis is ALNOR's range of rectangular ducts and fittings for ventilation systems.  \nThis catalogue presents the rectangular ducts and fittings sized in accordance with EN 1505:2001, “Ventilation for buildings. Sheet metal air ducts and fittings with rectangular  \nThe air tightness classes are specified in the table below.  \n\n| Duct air\u003Cbr>tightness\u003Cbr>class | Leakage rate\u003Cbr>limit value\u003Cbr>(fmax) m3s-1m-2 |\n| --- | --- |\n\nLimit values of static pressure (ps) Pa  \nVacuum pressure in each class  \nOverpressure in each class 1 2 3  \ncross-section. Dimensions” and reference standards. The surface area of ventilation ducts and fittings is measured according to DIN 18379, “German construction contract procedures – Part C: General technical specifications for building works – Room ventilation systems”. Rectangular ducts and fittings are designed for low-and medium-pressure indoor HVAC systems. Rectangular ducts and fittings made from stainless steel or aluminium are available on request if a higher corrosion protection level is required. Alnor also fabricates custom fittings to individual design requirements.  \nDimensions  \nThe nominal size is a conventional dimension used to designate and calculate straight ducts and fittings. It is the internal dimension of sides a and b, where side a is exposed to view (see Fig. 1) . The length sizes of the sides at a smaller end of an adapter fitting are designated c and d, where side c is exposed to view.  \nDimension L is the effective length of a straight duct, which is added to the overall length of the ductwork system. Dimension l is the effective length of a fitting, which is added to the overall length of the ductwork system.  \nThe standard dimensions of ducts and fittings range between 130 mm and 2500 mm for any side length. The ducts and fittings below and above these sizes are available on request. Measurements of the surface area and the lead time for custom ductwork orders are subject to separate arrangements.  \nTightness  \nD uct s a re made i n two a i r t ig ht ness c lassesacco rdi ng to P N-B-76 0 01 , “Ve nt ilat io n duct s . A i r tight ness , requi re me nt s and testi ng” and EN 1507,“Ventilation for buildings. Sheet metal air ducts with rectangular section. Requirements for strength and leakage”: Air tightness class A: standard in normal design versions; Air tightness class B: design versions with improved airtightness.  \nA 0.027 × ptest0.65 × 10-3 200 400  \n\n| B | 0.009 × ptest0.65 × 10-3 | 500 | 400 | 1000 2000 |\n| --- | --- | --- | --- | --- |\n| C | 0.003 × ptest0.65 × 10-3 | 750 | 400 | 1000 2000 |\n| D* | 0.001 × ptest0.65 × 10-3 | 750 | 400 | 1000 2000 |\n\nSpecial-purpose ventilation ducts  \nDesign  \nRectangular ducts and fittings are fabricated from metal sheets which are hemmed and seamed, pressure-welded, or riveted. The ducts and fittings are available in low- and mediumpressure versions (min. vacuum / max . overpressure):  \n class N design (low-pressure design): standard design from-400 Pa to +1000 Pa  \n class S design (medium-pressure design): from-1000 Pa to 2500 Pa  \nThe dimensional tolerances and metal sheet thickness are selected according to the following criteria:  \n length of the long side of a straight duct,  \n the dimension of the longest side of the connection crosssection  \nof the fitting.  \nTable 1 (see below) provides dimensional tolerances and minimum metal sheet thickness sizes.  \n\n| Dimension of\u003Cbr>the long side\u003Cbr>(mm) | Dimensional\u003Cbr>tolerance for\u003Cbr>the duct side\u003Cbr>(mm) | Class N\u003Cbr>minimum sheet\u003Cbr>thickness\u003Cbr>(mm) | Class S\u003Cbr>m","cbCailbfsA9tpqtl","https://ap.wps.com/l/cbCailbfsA9tpqtl","pdf",3459736,33,"English","# System description\n## Dimensions\n## Tightness\n# Special-purpose ventilation ducts\n## Design\n## Materials and tolerances","[{\"question\":\"What standards are used to size and evaluate the rectangular ducts and fittings?\",\"answer\":\"Sizing and dimensions follow EN 1505:2001, and surface area measurement follows DIN 18379. Requirements for strength and leakage reference EN 1507, and tightness class definitions cite PN-B-76001.\"},{\"question\":\"How are nominal dimensions and effective lengths defined for ducts and fittings?\",\"answer\":\"Nominal size is the internal side dimensions a and b, with side a visible, and adapter sides c and d where side c is visible. Effective length L is the added length for straight ducts, while effective length l is added for fittings.\"},{\"question\":\"What air-tightness classes and leakage limit approach are specified?\",\"answer\":\"Air tightness is provided in classes A and B for standard and improved airtightness design versions. The document lists leakage rate limit values (fmax) per class along with corresponding static pressure limit values and vacuum/overpressure ranges.\"}]","SQUER-Rectangular Ducts and Fittings - Technical Information | PDF",83]