Skip to content

Area of Rectangular Duct Calculator

6 comments

This calculator estimates the total surface area, shina length, and corner count required for manufacturing rectangular ventilation ducts. It considers duct dimensions, quantity, and optional seam allowances, making it essential for HVAC fabricators and planners.

Ventilation Duct Surface and Component Calculator

Input Fields
A
mm
B
mm
L
mm
N
If enabled, the result will update automatically when you change any value.

Area, Shina, and Corner Calculation Formula

Formula
\[\text{pl} = 2 \cdot \left( \frac{A}{1000} + \frac{B}{1000} + SC \right) \cdot \frac{L}{1000} \cdot N \]\[\text{Shina} = 2 \cdot \left( \left( \frac{A}{1000} + \frac{B}{1000} \right) \cdot 2 – S \right) \cdot N \]\[\text{Ugol} = 8 \cdot N \]

Where:

  • $$A$$, $$B$$ — side dimensions of the duct (in mm)
  • $$L$$ — length of the duct (in mm)
  • $$N$$ — number of duct units
  • $$SC = 0.02$$ if seam is enabled, otherwise 0
  • $$S = 0.12$$ if seam is enabled, otherwise 0


This calculator is designed to help engineers and HVAC installers determine the materials needed to fabricate rectangular ductwork. It converts all dimensions to meters, adds seam allowance where specified, and outputs the total surface area (pl), the length of the metal strip or shina (Shina), and the number of corner pieces (Ugol). This ensures accurate budgeting and cutting of materials for sheet metal ductwork.

Previous
Ventilation per Number of People

Leave a Reply

Your email address will not be published. Required fields are marked *

6 thoughts on “Area of Rectangular Duct Calculator

  1. mic says:

    how to convert Supply air ducts, rectangular 15,978 kg to square meter

  2. anthony says:

    how to get kg for elbow 90

  3. it is goods

  4. KhalidRahman says:

    Why I can’t get the answer

  5. Muhammed says:

    Good