{"product_id":"lambro-industries-135-galvanized-transition-4-in-round-to-rect","title":"Lambro Industries 135 Galvanized Transition 4 in Round to Rect","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe LAMBRO INDUSTRIES 135 is a galvanized steel duct transition fitting designed to connect 4-inch round ductwork to 3.25-inch by 10-inch rectangular duct sections. This type of transition is a standard component in residential and light commercial ventilation systems, allowing installers to adapt between round and rectangular duct profiles without fabricating a custom fitting. It is constructed from galvanized steel for corrosion resistance and durability in typical duct environments. HVAC technicians and sheet metal installers use this fitting when routing supply or exhaust air through tight spaces where duct geometry must change.\u003c\/p\u003e\n\u003cp\u003eThe 135 is suited for rigid ductwork installations in kitchens, bathrooms, and general HVAC supply and exhaust applications where a round-to-rectangular transition is required. It is commonly used where a 4-inch round collar connects to a flat rectangular duct run, such as range hood exhaust routing or low-profile supply runs through cabinetry or wall cavities. The galvanized construction makes it appropriate for kitchen exhaust service where grease-laden air and moisture are present.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eTransitions 4-inch round duct to 3.25-inch x 10-inch rectangular duct\u003c\/li\u003e\n  \u003cli\u003eGalvanized steel construction for corrosion and moisture resistance\u003c\/li\u003e\n  \u003cli\u003eCompatible with rigid ductwork systems\u003c\/li\u003e\n  \u003cli\u003eSuitable for kitchen exhaust, range hood venting, and general HVAC applications\u003c\/li\u003e\n  \u003cli\u003eStandard fitting geometry for straightforward field installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with rigid ductwork systems requiring a transition between 4-inch round and 3.25-inch x 10-inch rectangular duct profiles, including kitchen exhaust and general ventilation applications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by an HVAC technician or sheet metal installer. Secure all duct connections with sheet metal screws and seal joints with UL 181-rated foil tape or mastic per applicable mechanical codes before system startup. Verify that the fitting orientation matches the intended airflow direction before fastening. Do not compress or distort the fitting during installation, as dimensional changes will affect airflow and joint sealing.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProduct Type\u003c\/strong\u003e: Transition\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRound Size\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRectangular Size\u003c\/strong\u003e: 3.25 inches x 10 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Galvanized Steel\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: 135\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LAMBRO INDUSTRIES","offers":[{"title":"Default Title","offer_id":51161908707634,"sku":"135","price":18.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/306254187.jpg?v=1778885628","url":"https:\/\/voomisupply.com\/products\/lambro-industries-135-galvanized-transition-4-in-round-to-rect","provider":"Voomi Supply","version":"1.0","type":"link"}