AirClean Systems total exhaust polypropylene fume hoods are manufactured from structural polypropylene which offers excellent chemical resistance. AirClean Systems total exhaust hoods have baffling within the chamber that promotes a predictable and effective airflow pattern to capture toxic chemical fumes and vapors. The thermally fused seamless design provides a built-in work base that effectively contains liquids. AirClean Systems total exhaust laboratory fume hoods have a seamless design that guarantees NO MORE RUST!