VENTILATION DEVICE Russian patent published in 2015 - IPC A01F25/08 

FIELD: heating.

SUBSTANCE: ventilation device consists of perforated sections with stiffeners, which are made in the form of an arc with a shaped surface and with profile wave height of at least 5 mm. Supporting ends of the arc have sections parallel to the vertical arc axis. Height of parallel sections is 0.05 to 0.1 of the arc diameter. The sections are made with a pitch as to diameter. Diameter of the previous pitch section is less than diameter of the next pitch section by a value of two to four thicknesses of sheet material, from which sections are made.

EFFECT: invention ensures improvement of stability of sections of the device and contributes to more uniform air distribution throughout its length.

4 dwg