Calculate Rectangular Stack Equivalent Diameter & Area - Distance to Far Wall and near wall

Rectangular Stack or Duct Equivalent Diameter and Area Calculator (EPA Method 1)

Calculate the equivalent diameter and area of rectangular stacks or ducts using EPA Method 1. This responsive tool supports unit conversion and is ideal for determining cross-sectional area and sampling diameter in environmental stack testing or emissions analysis.

Units: Inches Millimeters Centimeters Meters

Length to Far Wall (Lfw): Length to Near Wall (Lnw): Width of Stack (W):