{"product_id":"southwark-metal-fb_17-1-2x28-1-2-furnace-return-air-duct-box","title":"Southwark Metal FB_17-1\/2X28-1\/2 Furnace Return Air Duct Box","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SOUTHWARK METAL FB_17-1\/2X28-1\/2 is a sheet metal furnace return air duct box built for residential and light commercial forced-air heating and cooling systems. Fabricated from hot dip galvanized steel, this box forms the return air plenum connection at the furnace cabinet, channeling airflow from the return duct system back into the unit. At 17.5 inches by 28.5 inches, it accepts a standard 16 x 25 filter, allowing filter installation directly at the air handler. Licensed HVAC technicians and sheet metal contractors install this component during new construction or system replacement.\u003c\/p\u003e\n\u003cp\u003eThis return air duct box is designed for use with upflow and downflow gas or electric furnaces where a dedicated return air connection box is required at the base or side of the cabinet. It is suited for residential new construction and retrofit applications where field-fabricated or supplier-sourced sheet metal plenums are standard practice. The 17.5 x 28.5 inch face dimension accommodates common furnace cabinet widths and integrates with standard rectangular duct systems. Its filter slot sizing for a 16 x 25 filter makes it a practical choice for applications where filter access at the unit is preferred.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eHot dip galvanized steel construction for corrosion resistance in air-handling environments\u003c\/li\u003e\n  \u003cli\u003e17.5 x 28.5 inch face dimensions sized for common residential furnace cabinets\u003c\/li\u003e\n  \u003cli\u003eAccepts a standard 16 x 25 filter for integrated filtration at the unit\u003c\/li\u003e\n  \u003cli\u003eMeets ACCA and SMACNA applicable standards for sheet metal duct fabrication\u003c\/li\u003e\n  \u003cli\u003eReturn air configuration for forced-air furnace system installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style sheet metal return air duct box for residential and light commercial forced-air furnace systems requiring a 17.5 x 28.5 inch return air opening with a 16 x 25 filter slot.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician or sheet metal contractor in accordance with SMACNA duct construction standards and local mechanical codes. Shut down and de-energize the furnace and air handler before beginning duct work. Seal all seams with UL-listed mastic or metal foil tape to maintain system static pressure and prevent air bypass. Secure the box to the furnace cabinet and duct system using sheet metal screws at standard spacing per SMACNA guidelines.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Hot Dip Galvanized Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFace Dimensions\u003c\/strong\u003e: 17.5 x 28.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Size\u003c\/strong\u003e: 16 x 25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Return Air Duct Box\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplicable Standards\u003c\/strong\u003e: ACCA, SMACNA\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: SOUTHWARK METAL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: FB_17-1\/2X28-1\/2\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51284106248498,"sku":"FB_17-1\/2X28-1\/2","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/309278381.jpg?v=1781068665","url":"https:\/\/voomisupply.com\/products\/southwark-metal-fb_17-1-2x28-1-2-furnace-return-air-duct-box","provider":"Voomi Supply","version":"1.0","type":"link"}