Patent ID: 8882491

Claim:
A connection duct between a blower of a burner and a mixing device of said burner, said connection duct for diverting outflowing air from said blower in a first direction into a second direction, and wherein said connection duct further comprises diverting means for diverting said air in a circular flow around said second direction; said diverting means are developed as a tube section, said tube section further comprising: (a) a first inflow opening; and (b) a second inflow opening, wherein said first inflow opening and said second inflow opening are: (i) diametrically opposed; and (ii) arranged in the peripheral wall of said diverting means and a longitudinal axis, wherein said longitudinal axis runs parallel to said second direction and said air from said first direction flows tangentially through said first and said second inflow openings into said tube section, wherein between said blower and said tube section, approximately parallel to said first direction, an air deflector is arranged such that a part of the inflow air is diverted into said tube section by means of said air deflector through said diametrically opposed inflow openings; wherein said air deflector inside said connection duct is arranged for variable configuration.