This Everbilt insulated flexible duct measures 7 inches in diameter and 25 feet in length, featuring an R6 thermal resistance rating for high energy efficiency. Designed for use in standard HVAC heating and cooling systems, it consists of a flexible core surrounded by fiberglass insulation and a durable, heavy-duty silver metallized jacket that resists tearing. The oversized core allows for quick and easy connection to standard sheet metal fittings, and the material can be easily cut to any desired length for custom installations in tight spaces. It is ETL listed and meets UL 181 Class 1 air duct standards for safety and performance

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