The Glowforge Ventilation Duct is a flexible duct with a 4-inch diameter and 8-foot length, designed for seamless integration into your heating and cooling system. Its laminated construction ensures durability and reliable performance. Perfect for efficiently routing air flow, this duct transitions smoothly and is compatible with various heating and cooling setups. With its quality brand name and high-quality materials, the Glowforge Ventilation Duct is a reliable choice for your ventilation needs.