AFC manufactures four different air make-up systems - three heated and one fresh air only. The first of these is the DFM heated air make-up system. It consists of the DFM800R (for standard booths) and the DFM2000 (for larger truck booths). The DFM is a direct fired air make-up system. This means that the system fires directly into the air stream. Firing directly into the air stream results in 98% efficiency, providing a rapid temperature rise in the booth and saving you money on operation cost.