THE ductwork bench

Features THE ductwork bench

Obtaining the accurate (+/- 1/00"/MM.) dimensions for the circumference of either outside(small end) and inside(large end) diameters of both circular straight Duct or Fittings.
Except where stated either Inch or Millimeters can be calculated.
For segmented circular bends of any diameter, throat radius and degree (Max.135 Degrees) will calculate, (excluding flange and joint allowances) the concise dimensions required for the pattern development.
For obtaining the correct angle of circular bends and length of straight Duct required for a circular offset, also too, the ability to calculate the both the true length and length of straight duct required for a circular offset with known angled bends.
Although the "China-mans hat" is not recommended for Kitchen extract terminals, at times it is used for other exhausts, the calculator will return all dimensions required for support leg lengths, top cowl and if mechanical the inverted cone.
Also will determine the free area according to the diameter of the main extract duct.
Included too, the calculation for obtaining the correct dimensions for altering Duct sections from Square, Rectangular and Flat Oval section without increasing friction loss, volume and velocity.