duct 29 of blower 28 of rectangular cross section is connected to tubular duct 11 coming from evacuation hood 10 above the bending station a turbine 32 with vanes 33 turns in a housing 31 while its bearings 34 are on the outside of housing 31 driving of turbine 32 is performed by a motor 36 outlet duct 37 having approximately the necessary cross section of the hot air current in the bending zone is located above blower 28 below the bending zone and comes out in flow duct 6 by which the gas current is directed toward the glass plates between supply duct 29 and tubular duct 11 is placed a duct section 39 in which electric heating devices are installed to heat the air current to the necessary temperature of about 650 u00b0 c in flow duct 6 are placed mobile flaps 42 by which the flow can be increased or reduced above these flaps 42 are placed vertical deflectors 44 which serve to make the gas flow regular fig3 and 4 in addition show conveyor rollers 1 rails 3 on which carriage 4 can move with carrying frame 5 and bending form 2 which is movably mounted in the vertical direction with a jack 20 or an equivalent mechanical lifting system jack 20 is mounted with braces 46 on the inside of evacuation hood 10 on both sides of the bending station can again be found the tempering.