T.N.F. Engineering supplies Dual Belt Lehr. T.N.F. Engineering offers different types metallic conveyer belts, material handling equipments, glass plant equipment, ovens and furnaces etc, I.S. Conveyor & cross conveyors, I.S. Conveyor & cross conveyors, single liners & cold end conveyor, turn tables etc. Dual Belt Lehr is suitable for medium scale glass plants. Dual Belt Lehr is provided with dual belts having individual belt drive systems but use the same heating source.