{"product_id":"retrotec-range-plugs-ductester","title":"Retrotec 4\" DucTester Range Plugs — Range 74, 47, 29 (US340x) \u0026 18, 11 (400 Series)","description":"\u003cp\u003e\u003cstrong\u003eTight ducts need a smaller hole.\u003c\/strong\u003e Retrotec's 4\" (10 cm) range plugs restrict the DucTester fan inlet so it can measure low airflow accurately. When a duct system is too tight for your current plug, the gauge shows \"--\" instead of a number. The right range plug turns that dash into a passing result.\u003c\/p\u003e\n\u003cp\u003eGenuine Retrotec parts. Push-in fit, durable, nothing to adjust. \u003cstrong\u003eCheck the fan series before you order:\u003c\/strong\u003e Range 74, 47 and 29 fit the residential \u003cstrong\u003eUS340x\u003c\/strong\u003e (300-series fan). Range 18 and 11 are for Retrotec's \u003cstrong\u003e400-series commercial DucTesters\u003c\/strong\u003e (US440x \/ US450x).\u003c\/p\u003e\n\u003ch3\u003eWhich range plug do I need?\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eRange plug\u003c\/th\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003cth\u003eBest for\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRange 74\u003c\/td\u003e\n\u003ctd\u003eRP074\u003c\/td\u003e\n\u003ctd\u003eUS340x (standard in kit)\u003c\/td\u003e\n\u003ctd\u003eMost systems: start here\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRange 47\u003c\/td\u003e\n\u003ctd\u003eRP047\u003c\/td\u003e\n\u003ctd\u003eUS340x (standard in kit)\u003c\/td\u003e\n\u003ctd\u003eTypical new construction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRange 29\u003c\/td\u003e\n\u003ctd\u003eRP029\u003c\/td\u003e\n\u003ctd\u003eUS340x (optional add-on)\u003c\/td\u003e\n\u003ctd\u003eTight ducts, small systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRange 18\u003c\/td\u003e\n\u003ctd\u003eRP018\u003c\/td\u003e\n\u003ctd\u003e400-series commercial (US440x \/ US450x)\u003c\/td\u003e\n\u003ctd\u003eTighter systems on commercial DucTesters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRange 11\u003c\/td\u003e\n\u003ctd\u003eRP011\u003c\/td\u003e\n\u003ctd\u003e400-series commercial (US440x \/ US450x)\u003c\/td\u003e\n\u003ctd\u003eVery low flows on commercial DucTesters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eNot sure which fan you have? The model number is on the fan label, or call (512) 650-VENT and we'll confirm before you order.\u003c\/p\u003e\n\u003ch3\u003eHow to pick the right range in the field\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStart on Range 74.\u003c\/strong\u003e Most duct systems test on it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGauge shows \"--\" at test pressure?\u003c\/strong\u003e The fan is turning too slowly to measure. Step down to a smaller range number.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFan hits 100% before reaching test pressure?\u003c\/strong\u003e Step up to a larger range number.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEvery time you swap plugs,\u003c\/strong\u003e change the Range setting on your DM32X gauge to match, or the flow reading will be wrong.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYour US340x ships with Range 74 and 47. If you're testing new homes built to modern code, multifamily units or small systems, \u003cstrong\u003eRange 29\u003c\/strong\u003e is the plug most raters add first.\u003c\/p\u003e\n\u003ch3\u003eDetails\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Retrotec part, sold individually\u003c\/li\u003e\n\u003cli\u003e4\" (10 cm) diameter\u003c\/li\u003e\n\u003cli\u003eShips direct from Retrotec\u003c\/li\u003e\n\u003cli\u003eQuestions about fit or which range you need? Call (512) 650-VENT.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eMake setup as fast as the test.\u003c\/strong\u003e Seal supply registers in seconds with \u003ca href=\"\/collections\/vent-caps\"\u003eVent Caps\u003c\/a\u003e, and the return grille with the \u003ca href=\"\/products\/duct-ninja-return-grille-seal\"\u003eDuct Ninja\u003c\/a\u003e. No ladder, no tape.\u003c\/p\u003e","brand":"Retrotec, Ltd.","offers":[{"title":"Range 29 (RP029) – US340x","offer_id":50912060440674,"sku":"RP029","price":80.0,"currency_code":"USD","in_stock":true},{"title":"Range 47 (RP047) – US340x","offer_id":50912060538978,"sku":"RP047","price":80.0,"currency_code":"USD","in_stock":true},{"title":"Range 74 (RP074) – US340x","offer_id":50912060571746,"sku":"RP074","price":80.0,"currency_code":"USD","in_stock":true},{"title":"Range 18 (RP018) – 400 Series","offer_id":50912060473442,"sku":"RP018","price":80.0,"currency_code":"USD","in_stock":true},{"title":"Range 11 (RP011) – 400 Series","offer_id":50912060506210,"sku":"RP011","price":80.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/2823\/files\/Retrotec_-_RP029_-_Range_Plug_29.png?v=1794004356","url":"https:\/\/ventcapsystems.com\/products\/retrotec-range-plugs-ductester","provider":"Vent Cap Systems","version":"1.0","type":"link"}