{"product_id":"southwark-metal-sp58-24ga_18x16-spiral-pipe-reducer","title":"Southwark Metal SP58-24GA_18X16 Spiral Pipe Reducer","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SOUTHWARK METAL SP58-24GA_18X16 is a tapered spiral pipe reducer fabricated from hot dip galvanized steel at 24 gauge material thickness. It transitions round spiral ductwork from an 18-inch diameter down to a 16-inch diameter in a single fitting. The tapered profile maintains smooth airflow through the transition, reducing turbulence and pressure drop at the connection point. HVAC sheet metal mechanics install this fitting in low-pressure supply and return air distribution systems where a step-down in duct diameter is required. Construction meets ACCA and SMACNA standards for commercial and residential duct fabrication.\u003c\/p\u003e\u003cp\u003eThis reducer is suited for residential and light commercial HVAC duct systems using spiral round pipe. Typical applications include main trunk-to-branch transitions, air handler supply plenums, and rooftop unit distribution runs where duct diameter decreases as airflow is distributed to successive zones or outlets. The galvanized steel construction holds up in both conditioned and unconditioned spaces such as attics, mechanical rooms, and crawlspaces.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTapered design provides smooth diameter transition from 18 inches to 16 inches\u003c\/li\u003e\n\u003cli\u003eHot dip galvanized steel resists corrosion in humid and unconditioned installation environments\u003c\/li\u003e\n\u003cli\u003e24 gauge material thickness meets SMACNA and ACCA fabrication standards for spiral duct fittings\u003c\/li\u003e\n\u003cli\u003eCompatible with standard spiral round duct pipe systems\u003c\/li\u003e\n\u003cli\u003eTapered geometry minimizes static pressure loss through the transition\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and new-installation fitting for residential and light commercial spiral round duct systems with an 18-inch to 16-inch diameter transition, built to ACCA and SMACNA applicable standards.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by licensed HVAC technicians or qualified sheet metal mechanics. Shut down and lock out the air handling unit before cutting into or connecting ductwork. Secure the fitting to adjoining spiral pipe sections using sheet metal screws and seal all joints with UL-listed duct sealant or foil tape per SMACNA installation guidelines. Do not compress or over-crimp the fitting ends during installation, as deformation will affect the sealing surface.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarger End Diameter\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmaller End Diameter\u003c\/strong\u003e: 16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Hot Dip Galvanized Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Thickness\u003c\/strong\u003e: 24 Gauge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplicable Standards\u003c\/strong\u003e: ACCA, SMACNA\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SOUTHWARK METAL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: SP58-24GA_18X16\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51283961545010,"sku":"SP58-24GA_18X16","price":68.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/309278000.jpg?v=1781064304","url":"https:\/\/voomisupply.com\/products\/southwark-metal-sp58-24ga_18x16-spiral-pipe-reducer","provider":"Voomi Supply","version":"1.0","type":"link"}