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Custom OEM Straight Finned Tubular Heater for Industrial Duct Air Heater Resistance Box OEM. Custom OEM straight finned tubular heater for industrial duct air heating and resistance box applications - SS304 tube with carbon steel or SS fins, manufactured to customer drawing. Higher surface area than plain tubular heaters - improved heat transfer efficiency for forced air systems, 200V to 450V, 200W to 3000W, fin pitch and length customizable. MOQ 500 pieces, sample from 1 piece, 30-day lead time. RoHS compliant. CE documentation available on request for European market buyers.