Duct Weight Calculator

Formula

To calculate the weight of a duct:

\[ DW = ((2 \cdot (H + W)) \cdot L \cdot T) \cdot D \]

Where:

\(DW\) is the duct weight in pounds (lbs)
\(H\) is the duct height in inches (in)
\(W\) is the duct width in inches (in)
\(L\) is the duct length in inches (in)
\(T\) is the duct thickness in inches (in)
\(D\) is the duct density in pounds per cubic inch (lbs/in³)

What is Duct Weight?

The weight of a duct is calculated based on its dimensions (height, width, length, and thickness) and the density of the material used. This calculation helps in determining the load-bearing capacity required and the overall structural support needed for the ductwork in construction or HVAC systems.

Example Calculation 1

Let's assume the following values:

Duct Height (\(H\)) = 10 inches
Duct Width (\(W\)) = 12 inches
Duct Length (\(L\)) = 20 inches
Duct Thickness (\(T\)) = 0.5 inches
Duct Density (\(D\)) = 1 lbs/in³ (for aluminum)

Use the formula:

\[ DW = ((2 \cdot (10 + 12)) \cdot 20 \cdot 0.5) \cdot 1 = (2 \cdot 22 \cdot 20 \cdot 0.5) \cdot 1 = 440 \text{ lbs} \]

The duct weight is 440 lbs.

Example Calculation 2

Let's assume the following values:

Duct Height (\(H\)) = 8 inches
Duct Width (\(W\)) = 10 inches
Duct Length (\(L\)) = 15 inches
Duct Thickness (\(T\)) = 0.75 inches
Duct Density (\(D\)) = 1.2 lbs/in³

Use the formula:

\[ DW = ((2 \cdot (8 + 10)) \cdot 15 \cdot 0.75) \cdot 1.2 = (2 \cdot 18 \cdot 15 \cdot 0.75) \cdot 1.2 = 486 \text{ lbs} \]

The duct weight is 486 lbs.