Thermaflex®’s Pro Series flexible duct products are the most reliable and durable products in the commercial HVAC industry. All products are GREENGUARD Certified and feature a full 10 Year Pro Warranty, the best in the industry. For homeowners, builders and HVAC contractors who want a superior IAQ product, EverClean™ comes GREENGUARD Certified and features a Lifetime Warranty to the original homeowner. Flex-Vent offers a complete line of high-quality, value-priced duct products for residential applications and all feature a 10 Year Warranty. Three grades of products, each one a perfect match for a specific application.