The manufactured coil is submersion tested at 200 psi to assure coil is leak-free. Air flow is directed by manually adjustable louver blades. Header coil construction elements and heavy-wall tubing. Element tubes are brazed into the extruded header junctions. Pipe connection saddles are made of cast bronze and are brazed to the copper headers. Suitable for use in heating warehouses, manufacturing facilities, garages, and other large, open, nonexplosive, noncorrosive areas. ETL Certified and ETL rated to 150 lb. saturated steam at 366.