Series GMC and GMP Direct Gas Fired Make-up heaters come in a broad range of axial, centrifugal and econo models. Models are available in vertical or horizontal configurations to fit any application. Performance range from 3000 through 100,000 CFM at static pressure to 2-1/2". Units are painted galvannealed steel with internal plumbing and controls. Units are certified by major testing agencies. Options include recirculation and evaporative cooling. Steam Make-up units and steam unit heaters are also available. Direct fired gas door heaters for spot heating over shipping and receiving doors are available up to 1,000,000 BTU.