The Flow Sciences ETA Top Mount Series Bag-in/Bag-out safety containment systems are designed to recirculate filtered air back into the lab or attach to house exhaust with optional thimble accessory. The Bag-in/Bag-out system is designed for safe disposal and replacement of the HEPA filter by a certified technician. Convenient front panel access has an Easy-Lock system that secures the filter so NO tools are required. A secondary HEPA filter is located between the primary filter and the motorized impeller to prevent any contaminants that might migrate downstream during Bag-in/Bag-out disposal.