Mintie Technologies Environmental Control Unit, 30"x 56" ceiling cavity. Brand new in box, same model as shown in the last few pictures, which I also have for sale. The modular ECU4 Ceiling CavityTM is a collapsible, portable containment unit designed to control dust and airborne contaminants during building maintenance or other projects above the ceiling cavity. Perfect for quick, multiple entries, it can also be securely set up for longer-term jobs. Its standardized, single-unit size makes it an easy, convenient alternative to poles and plastic sheeting. Simply wheel it into place, extend it, and secure it to the ceiling. When paired with a HEPA-filtered negative air machine (not included), the ECU Ceiling CavityTM ensures full compliance and is ready for use.