Industrial space heating systems heat large spaces comfortably and economically. The 92% thermally efficient direct gas-fired burners promote excellent space comfort and low operating cost. The space heating line includes the 100% outdoor air, 50/50 fixed recirculation, and 80/20 recirculation systems. These systems provide many options to meet the needs of any space heating application. The 100% outdoor air systems provide a great option for low insulated spaces with high infiltration rates such as warehouses and distribution centers. These units cycle the blower and burner on a call for heat from the space, supplying air at a high velocity and high discharge temperatures (120°F to 140°F).