The UnderDuct and Corrosion Composites brands are leaders within the Fiberglass Reinforced Plastic (FRP) market. The brands are promoted within the overall Monoxivent framework. Our dedicated efforts, from concept to completion, have positioned Monoxivent FRP for continual success within industrial, commercial, and residential segments. Located in Rock Island, IL, we design, engineer, and manufacture HVAC UnderDuct and specialty Corrosion Composites projects. Monoxivent’s manufacturing source has over 50 years of experience and is a leader in the FRP Duct and corrosion markets. Monoxivent has a nationwide network of sales representatives and a top-tier inside support staff.