Area of Rectangular Duct Calculator

Ventilation Duct Surface and Component Calculator

Input Fields

Side A

A

mm

Side B

B

mm

Length

L

mm

Number

N

Consider seams

CalculateReset

Your Results

Area products

Tire

Corner

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Area, Shina, and Corner Calculation 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.