A round air duct is more economical than a rectangular air duct. It requires less sheet metal to produce. Since with equal areas for a circle and a rectangle, the circumference will be less than the sum of the lengths of the sides of the rectangle. Also, aerodynamic losses in a rectangular duct will be more than in a round one. The disadvantage of a round duct in relation to the rectangular one will be more complex design. The program on this page of the site will calculate the unfolded lateral surface of the tapered increaser with offset axes according to the second computation option (with an inaccessible vertex).
Unfolded lateral surface of the oblique truncated cone with an inaccessible vertex.
It is cut out on sheet metal with further circular rolling.
Sheet thickness (s)
mm
Height of tapered increaser (H)
mm
Offset of axes of bases (C)
mm
Outer diameter (D) of larger base
mm
Outer diameter (d) of smaller base
mm
Number (n) of split points
point