{"product_id":"8-10-bbq-dual-duct-high-performance-roof-cap","title":"8\"-10\" Dual Outlet High Performance Roof Cap for BBQ Hoods","description":"\u003cp\u003eThe 8-10\" BBQ Dual Duct High Performance Roof Cap terminates two separate duct runs through a single roof penetration. Each outlet accepts either 8\" or 10\" rigid duct, and the two paths stay independent all the way through the cap — no Y fittings, no merging, no shared discharge opening.\u003c\/p\u003e\n\u003ch2\u003eTwo ducts in, two ducts out\u003c\/h2\u003e\n\u003cp\u003eProline BBQ Wall Canopy and BBQ Island hoods vent through two 8\" ducts rather than one. The common workaround is a Y fitting that merges both runs into a single larger duct before the roof. That transition is where airflow gets lost: combining two streams into one creates turbulence, raises static pressure, and makes the blower work harder to move less air.\u003c\/p\u003e\n\u003cp\u003eThis cap eliminates that step. Each run keeps its own path from the hood to open air, so the exhaust volume your hood is rated for is the volume that actually leaves the building.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo independent duct outlets\u003c\/strong\u003e — each run vents on its own. No Y fittings, no merged airflow, no shared discharge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccepts 8\" or 10\" rigid duct\u003c\/strong\u003e — each collar fits either size, so one cap covers the dual 8\" runs on Proline BBQ hoods and larger 10\" systems alike.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle roof penetration\u003c\/strong\u003e — both runs exit through one flashed opening instead of cutting and sealing two.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-CFM airflow path\u003c\/strong\u003e — engineered for the discharge volume of Proline's outdoor BBQ hoods, not scaled down from an indoor cap.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeather-resistant construction\u003c\/strong\u003e — PAC-CLAD powder coat steel is built to hold up to sun, rain, snow, and freeze-thaw cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated flashing\u003c\/strong\u003e — square perimeter flange for a clean, watertight penetration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackdraft protection\u003c\/strong\u003e — inline dampers included on each outlet keeps cold air, wind, and pests from traveling back down the duct.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBird and debris screen\u003c\/strong\u003e — mesh screen blocks nesting without meaningful restriction.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat it fits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eProline BBQ Wall Canopy (BBQ WC) outdoor range hoods — dual 8\" duct configuration\u003c\/li\u003e\n\u003cli\u003eProline BBQ Island outdoor range hoods — dual 8\" duct configuration\u003c\/li\u003e\n\u003cli\u003eAny two-duct exhaust system using 8\" or 10\" rigid duct\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation notes\u003c\/h2\u003e\n\u003cp\u003eRun both ducts to the cap as separate lines. Do not combine them with a Y fitting or reduce duct size anywhere between the hood and the roof — either move undoes the benefit of a dual duct system.\u003c\/p\u003e\n\u003cp\u003eKeep runs as short and straight as possible, use rigid duct rather than flex, and seal all joints with foil tape or duct sealant. Follow local building codes for clearance from ridges, valleys, and adjacent openings.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 209px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eOutlets\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003e2 independent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eDuct size per outlet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003e8\" or 10\" rigid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eOverall dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003e28\" W x 25.5\" D x 10\" H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eBase \/ flashing size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003e28\" W x 25.5\" D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003ePAC-CLAD powder coat steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003eBlack powder coat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eMax recommended CFM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003e2000+ CFM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eDamper\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003eInline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eScreen\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003eMesh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eRoof pitch range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003eUp to 8:12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 51.241135%; height: 19px;\"\u003e\u003cstrong\u003eShipping weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.695035%; height: 19px;\"\u003e15lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\u003cbr\u003e\u003c\/h2\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eDoes this combine both ducts into one outlet?\u003c\/h3\u003e\n\u003cp\u003eNo. The two duct paths stay completely separate through the single cap and discharge independently. Nothing is merged or transitioned into a single larger duct.\u003c\/p\u003e\n\u003ch3\u003eCan I run 8\" duct to one outlet and 10\" to the other?\u003c\/h3\u003e\n\u003cp\u003eEach collar accepts either size, so mixed configurations are possible. That said, matching both runs to your hood's outlet size is the better setup — mismatched duct sizes create uneven resistance between the two paths.\u003c\/p\u003e\n\u003ch3\u003eMy hood has dual 8\" outlets. Do I need to upsize to 10\"?\u003c\/h3\u003e\n\u003cp\u003eNot necessarily. Run 8\" the whole way if your duct length is reasonable. Upsizing to 10\" can help on long runs or installations with multiple elbows, where cumulative resistance becomes a factor.\u003c\/p\u003e\n\u003ch3\u003eCan I use a standard single-duct roof cap instead?\u003c\/h3\u003e\n\u003cp\u003eOnly by Y-ing both runs into one, which is exactly the restriction this cap is built to avoid. Merging two streams into a single opening raises static pressure and cuts effective CFM at the cooking surface.\u003c\/p\u003e\n\u003ch3\u003eWill this work for a wall-mounted duct run?\u003c\/h3\u003e\n\u003cp\u003eThis cap is designed for roof terminations. For a horizontal run exiting through a wall, you'll want a dual duct wall cap instead.\u003c\/p\u003e","brand":"Proline Range Hoods","offers":[{"title":"8-10\" Dual BBQ High Performance Roof Cap","offer_id":52470779838766,"sku":"DUAL 8\" BBQ ROOF CAP","price":539.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0842\/0566\/6606\/files\/PP_DUAL_BBQ_ROOF_CAP_Angled.png?v=1787092399","url":"https:\/\/prolinerangehoods.com\/products\/8-10-bbq-dual-duct-high-performance-roof-cap","provider":"Proline Range Hoods","version":"1.0","type":"link"}