The Purair RX from Air Science USA, Fort Myers, Fla, is designed to protect the user and the environment from hazardous powders and particulates that are generated on the work surface. The unit features an optional SafeSwitch filter shutter system for safer bag-in/bag-out filter exchange. It also includes filter clamping that eliminates bypass leakage, an exhaust canopy for thimble ducting to the facility exhaust system, and an airflow monitor with a built-in low airflow alarm. The hood is available in 24-, 36-, and 48-inch models. For more information, visit Air Science USA.