{"product_id":"lambro-industries-235-plastic-vent-adapter-4-to-3-inch","title":"Lambro Industries 235 Plastic Vent Adapter 4 to 3 Inch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe LAMBRO INDUSTRIES 235 is a plastic vent adapter designed to transition between 4-inch and 3-inch duct diameters. It installs in residential and light commercial ventilation systems where a size change is needed along the duct run. The adapter works in both directions, fitting 4-inch to 3-inch or 3-inch to 4-inch configurations depending on installation orientation. HVAC technicians and installers use this part during new construction and retrofit work when connecting exhaust or supply duct sections of differing diameters. Plastic construction keeps the part lightweight and resistant to moisture in typical indoor ventilation environments.\u003c\/p\u003e\n\u003cp\u003eThis adapter is used in dryer exhaust venting, bathroom exhaust fans, range hood ducting, and general HVAC supply and return runs that require a diameter transition. It is suited for residential installations where duct routing requires a step-down or step-up between 4-inch and 3-inch round duct sections. The bidirectional design reduces the need to stock separate reducers and increasers for common 4-inch and 3-inch duct pairings.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eTransitions between 4-inch and 3-inch round duct diameters in either direction\u003c\/li\u003e\n  \u003cli\u003ePlastic construction resists moisture and corrosion in ventilation applications\u003c\/li\u003e\n  \u003cli\u003eLightweight design simplifies handling and installation in tight spaces\u003c\/li\u003e\n  \u003cli\u003eSold individually per unit of measure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation fitting for residential and light commercial ventilation duct systems using 4-inch and 3-inch round duct connections.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by a licensed HVAC technician or qualified installer. Power down any connected fan or air handler before working on the duct run. Secure the adapter to duct sections using appropriate metal foil tape or approved mechanical fasteners per local mechanical code requirements. Do not use standard cloth-backed duct tape on exhaust applications.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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: 3 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Plastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.08 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnit of Measure\u003c\/strong\u003e: Each\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 12\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: LAMBRO INDUSTRIES\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 235\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LAMBRO INDUSTRIES","offers":[{"title":"Default Title","offer_id":51525497127218,"sku":"235","price":45.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0c779ee7728ad725f17f4b964aeec37f.jpg?v=1785475597","url":"https:\/\/voomisupply.com\/products\/lambro-industries-235-plastic-vent-adapter-4-to-3-inch","provider":"Voomi Supply","version":"1.0","type":"link"}