Square Duct Weight Calculator

Square Duct Weight Formula:

\[ Weight (lbs/ft) = (Side (in)^2 \times Thickness (in) \times Density (lb/in^3)) \times Perimeter / 12 \]

Weight (lbs/ft):

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1. What is Square Duct Weight Calculation?

The Square Duct Weight Calculator estimates the weight per foot of square ductwork based on side dimension, thickness, and material density. This calculation is essential for HVAC system design, structural support planning, and material estimation.

2. How Does the Calculator Work?

The calculator uses the square duct weight formula:

\[ Weight (lbs/ft) = (Side (in)^2 \times Thickness (in) \times Density (lb/in^3)) \times Perimeter / 12 \]

Where:

\( Side \) — Side length of square duct (inches)
\( Thickness \) — Material thickness (inches)
\( Density \) — Material density (pounds per cubic inch)
\( Perimeter \) — 4 × Side (inches)
12 — Conversion factor from inches to feet

Explanation: The formula calculates the cross-sectional area, multiplies by thickness and density to get volume weight, then adjusts for perimeter and converts to weight per foot.

3. Importance of Duct Weight Calculation

Details: Accurate duct weight calculation is crucial for proper structural support design, transportation planning, installation safety, and material cost estimation in HVAC projects.

4. Using the Calculator

Tips: Enter side dimension in inches, thickness in inches, and material density in lb/in³. All values must be positive numbers. Common steel density is approximately 0.283 lb/in³.

5. Frequently Asked Questions (FAQ)

Q1: Why calculate duct weight per foot?
A: Weight per foot helps determine support spacing requirements, crane capacity needs, and overall structural loading for ductwork systems.

Q2: What are typical density values for duct materials?
A: Steel: 0.283 lb/in³, Aluminum: 0.098 lb/in³, Galvanized steel: 0.283 lb/in³, Stainless steel: 0.290 lb/in³.

Q3: How does thickness affect duct weight?
A: Weight increases linearly with thickness - doubling the thickness doubles the weight, assuming other factors remain constant.

Q4: Can this calculator be used for rectangular ducts?
A: No, this calculator is specifically for square ducts. Rectangular ducts require different perimeter calculations.

Q5: Why is perimeter included in the calculation?
A: Perimeter accounts for the full cross-sectional area of the duct material, ensuring accurate weight calculation for the entire duct section.