{"product_id":"duravent-0405inc-b-vent-increaser-4x5-inch-double-wall","title":"Duravent 0405INC B-vent Increaser 4x5 Inch Double Wall","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe DURAVENT 0405INC is a double-wall B-vent increaser fitting designed to transition vent diameter from 4 inches to 5 inches within Type B gas vent systems. This fitting connects between existing vent sections where a diameter increase is required, allowing the system to step up to larger vent pipe without interrupting the double-wall construction. Proper double-wall design maintains required clearances to combustibles throughout the transition. Licensed HVAC technicians and gas appliance installers use this fitting during new vent installations and system modifications on Category I gas appliances.\u003c\/p\u003e\u003cp\u003eThis increaser fitting is used in residential and light commercial Category I gas appliance venting applications where the vent system must transition from a 4-inch diameter run to a 5-inch diameter run. Typical scenarios include connecting to a larger vent manifold, stepping up at a tee, or meeting manufacturer-specified vent sizing requirements for longer vent runs. The fitting is installed inline between standard DVP-series B-vent sections.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eIncreases vent diameter from 4 inches to 5 inches in a single fitting\u003c\/li\u003e\n\u003cli\u003eDouble-wall construction maintains clearances to combustibles at the transition point\u003c\/li\u003e\n\u003cli\u003eDesigned for Category I gas appliance venting systems\u003c\/li\u003e\n\u003cli\u003eInstalls inline between standard B-vent sections for seamless integration\u003c\/li\u003e\n\u003cli\u003eCompatible with DVP-series double-wall B-vent components\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with DVP-series double-wall Type B gas vent systems, transitioning from 4-inch to 5-inch diameter vent sections in Category I gas appliance installations.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician or qualified gas appliance installer in accordance with NFPA 54 and local mechanical codes. Shut off the gas supply and allow the appliance to cool completely before servicing any vent components. Ensure all vent joints are properly engaged and secured per the manufacturer instructions, and verify that required clearances to combustibles are maintained throughout the entire vent system after installing this fitting.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Diameter\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutlet Diameter\u003c\/strong\u003e: 5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Double Wall\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVent Category\u003c\/strong\u003e: Category I (Type B Gas Vent)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: DURAVENT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 0405INC\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DURAVENT","offers":[{"title":"Default Title","offer_id":51343368257842,"sku":"0405INC","price":53.29,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310555412.jpg?v=1782020936","url":"https:\/\/voomisupply.com\/products\/duravent-0405inc-b-vent-increaser-4x5-inch-double-wall","provider":"Voomi Supply","version":"1.0","type":"link"}