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•On the top of the upper cylindrical part 24 or on one of the extensions 33 or 34, of the chimney 2, the cap 3 is placed, which can rotate on the top of the chimney 2 according to the wind direction w. In that way the exit of the chimney 2 gets more suction power, because the cap 3, create the zone of pressure reduction --------- due to the air streaming around its surface, and this reduction of the pressure is transferred to the top of the chimney 2 and that’s how cap increases the power of the chimney, and the power of el. generator 32 as well.

•Cap 3 has outer transparent layer 38 or/and 39, and inner layer 41, which has thermo accumulating properties. Outer layer 38 is made of transparent materials with imprinted pattern with tiny holes 45, while outer layer 39 is made of transparent materials with imprinted pattern without tiny holes. Tiny holes 45 are made in order to enable exit of the air from the air gap 40 out of the layer 38. In that way the outer layer 38 with imprinted pattern with tiny holes creates a zone of air whirling and low pressure, and hence increases the suction power (draft) in the cap 3 and the chimney 2. The inner layer 41 is made as an shell with thermo accumulating properties. Between outer layers 38 and/or 39 and inner layer 41, in the gap 40 with air some pressure sensors are installed.

•The cap 3 is constructed with additional aerodynamic openings 43 on leeward side, for rapid air release from the gap 40, and with flaps 44 to maintain direction of the cap according to wind direction w. The cap 3, must have aerodynamic shape, very light, that can be easily redirected toward the direction of the wind w, which is accomplished with the use of an rotating electromagnetic bearing 54, which can hold the cap 3, attached to the chimney 2, and allows that the cap to swivel freely around longitudinal axis of the chimney 2. The cap 3, is pulled near the bearing 54, with electromagnetic forces and then locked in place mechanically, in the way that is able to rotate around longitudinal axes of the chimney. Direction of the cap 3, towards the wind, is accomplished with flaps 44, and with non-equal distances between front and rear end of the cap 3 in favour to rear end, from longitudinal axes of the chimney 2.

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