{"product_id":"quietflex-16km-flexible-duct-16-inches-r-4-2-25-feet","title":"Quietflex 16KM Flexible Duct 16 Inches R-4.2 25 Feet","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe QUIETFLEX 16KM is a 16-inch diameter flexible duct designed for high-capacity airflow in residential and light commercial HVAC systems. The duct ships in a 25-foot length and carries an R-4.2 insulation value, providing reliable thermal protection that helps maintain consistent supply and return air temperatures. A foil outer jacket resists tearing and moisture intrusion, while the flexible inner core supports smooth, low-noise airflow. Licensed HVAC technicians and sheet metal installers work with this product during new construction and system retrofit projects.\u003c\/p\u003e\n\u003cp\u003eThe 16KM is suited for both supply and return air trunk and branch runs in forced-air systems. Its 16-inch diameter makes it appropriate for high-volume main-trunk applications in residential systems and smaller commercial air-handling setups. The 25-foot continuous length reduces the number of joints required, which limits potential air leakage points in the duct run.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e16-inch inside diameter supports high-volume airflow in large trunk runs\u003c\/li\u003e\n  \u003cli\u003eR-4.2 insulation value limits conductive heat gain and loss\u003c\/li\u003e\n  \u003cli\u003eFoil outer jacket resists tearing, puncture, and moisture\u003c\/li\u003e\n  \u003cli\u003e25-foot length reduces connection points and potential leakage\u003c\/li\u003e\n  \u003cli\u003eFlexible inner core allows bending around framing and obstructions\u003c\/li\u003e\n  \u003cli\u003eSuitable for both supply and return air applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style flexible duct section for use in residential and light commercial forced-air HVAC systems requiring a 16-inch round duct connection.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician in accordance with applicable mechanical codes and SMACNA flexible duct installation standards. Power down and lock out the air-handling unit before connecting or modifying any duct sections. Secure each end with an approved clamp and mastic or UL-listed foil tape — do not use standard cloth duct tape. Keep bends as gradual as possible and avoid sharp kinks that restrict airflow and reduce system efficiency.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation R-Value\u003c\/strong\u003e: R-4.2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eJacket Material\u003c\/strong\u003e: Foil\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Supply and return air\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: QUIETFLEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 16KM\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"QUIETFLEX","offers":[{"title":"Default Title","offer_id":51342925201714,"sku":"16KM","price":181.06,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310552674.jpg?v=1782010768","url":"https:\/\/voomisupply.com\/products\/quietflex-16km-flexible-duct-16-inches-r-4-2-25-feet","provider":"Voomi Supply","version":"1.0","type":"link"}