Duct Size Area Calculator

Duct Type:

Major Axis (W):

Minor Axis (H):

Length (L):

Width (W):

Height (H):

Length (L):

Width (W):

Height (H):

Width (W):

Height (H):

Radius (R):

Angle (θ, degrees):

Larger Width (W):

Larger Height (H):

Smaller Width (w):

Smaller Height (h):

Length (L):

Diameter (D):

Length (L):

Width (W):

Height (H):

Length 1 (L1):

Length 2 (L2):

Width (W):

Height (H):

Diameter (D):

Length (L):

Width 1 (W1):

Height 1 (H1):

Length 1 (L1):

Width 2 (W2):

Height 2 (H2):

Length 2 (L2):

Width 3 (W3):

Height 3 (H3):

Length 3 (L3):

Width 1 (W1):

Height 1 (H1):

Length 1 (L1):

Width 2 (W2):

Height 2 (H2):

Length 2 (L2):

Width 3 (W3):

Height 3 (H3):

Length 3 (L3):

Duct Area (square feet):

Duct Area (square meters):

Duct Size to Area Calculator

The duct area can be calculated using the following formulas:

Cross-Sectional Area for Different Duct Types:

Flat Oval Duct: \( \text{Area} = 2(W + \pi r) \times L \), where \( r = \frac{H}{2} \)
Rectangular Duct: \( \text{Area} = (W \times H) \)
Rectangular Duct End Cap: \( \text{Area} = W \times H \)
Rectangular Elbow: \( \text{Area} = (W + H) \times 2 \times \text{Arc Length} \), where \( \text{Arc Length} = \frac{\theta}{360} \times 2 \pi R \)
Rectangular Duct Reducer: \( \text{Area} = (W + H + w + h) \times L \)
Rectangular Duct Offset: \( \text{Area} = 2(W + H) \times (L1 + L2) \)
Rectangular Duct Transition: \( \text{Area} = (W + H + \pi r) \times L \), where \( r = \frac{D}{2} \)
Rectangular Duct Equal Tee: \( \text{Area} = 2(W1 + H1)L1 + 2(W2 + H2)L2 + 2(W3 + H3)L3 \)
Rectangular Duct Reducing Tee: \( \text{Area} = 2(W1 + H1)L1 + 2(W2 + H2)L2 + 2(W3 + H3)L3 \)

Parameters:

- \( W \): Width of the duct (Major Axis for Flat Oval Duct).
- \( H \): Height of the duct (Minor Axis for Flat Oval Duct).
- \( L \): Length of the duct.
- \( r \): Radius (for Flat Oval Duct and Elbow).
- \( \theta \): Angle of the elbow (in degrees).
- \( w, h \): Smaller width and height for the reducer.

Example Calculation

For a Flat Oval Duct with Major Axis (W) = 24 inches, Minor Axis (H) = 12 inches, Length (L) = 5 feet:
1. Duct Area: \( \text{Area} = 2\left(\frac{24}{12} + \pi \times \frac{\frac{12}{12}}{2}\right) \times 5 \approx 47.85 \, \text{sq ft} \)

Frequently Asked Questions

What is the purpose of this calculator?

This calculator helps determine the area of a duct based on its size, useful in HVAC and duct design.

Can I use different units for the inputs?

Yes, the calculator supports various units for duct dimensions. All inputs are converted to standard units for accurate calculations.

Why are the results shown in multiple units?

The results are displayed in multiple units (e.g., square feet and square meters) to allow you to use the value in your preferred unit.

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