A closed-loop system is an extraction method used to create cannabis concentrates. During the process, no solvents are exposed to the open air but are contained within a closed loop system.

The closed-loop extraction system has been used for decades to produce perfume, food additives, and beauty products. Only recently has the method been utilized in creating cannabis oil. It is far safer than open blasting. Utilizing the system is a safer way to work with flammable solvents. The extraction machinery has no openings, so it successfully contains the solvents in a safe and contained environment.