Calculate hvac channel diameter, speed, kayıp and fan basıncı using engineering units and the defined formula.
HVAC Duct Diameter, Velocity, Loss and Fan Pressure Calculator
Calculate hvac duct diameter, velocity, loss and fan pressure calculator using engineering units and the defined formula.
Result chart
Formula and calculation steps
Note: Results are for preliminary engineering evaluation. Verify assumptions, material data, safety factors, applicable standards, and manufacturer limits before final design. Tool version 2.7.1
How to use this calculator
- Enter the measurements and operating values.
- Select the correct engineering unit for each value.
- Press Calculate to view the result and intermediate values.
- Review the equation steps and download a PDF report if needed.
Equation used
D=√(4Q/πv); Δp=[fL/D+ΣK]ρv²/2
How to evaluate the result
Results are for preliminary engineering evaluation. Verify assumptions, material data, safety factors, applicable standards, and manufacturer limits before final design.
Technical references
Input guide for HVAC Duct Diameter, Velocity, Loss and Fan Pressure Calculator
Calculate hvac duct diameter, velocity, loss and fan pressure calculator using engineering units and the defined formula. The table below summarises the inputs and example starting values.
| Parameter | Example value | Units and description |
|---|---|---|
| Air debisi | 5000 | m³/h |
| Hedef hız | 7 | m/s |
| Channel boyu | 80 | m |
| Roughness | 0.15 | mm |
| Toplam yerel kayıp ΣK | 12 | Dimensionless or selection value |
| Air yoğunluğu | 1.2 | kg/m³ |
| Fan andrimi | 70 | % |
Example calculation scenario
For an initial check, enter the example values from the table, select the required units, and choose Calculate. Review the main result and equation, then replace the examples with measured or design data from your system.
Common mistakes when using HVAC Duct Diameter, Velocity, Loss and Fan Pressure Calculator
- Ignoring transmission efficiency, service factor, or transient operating conditions.
- Mixing unit systems without checking the selected units.
- Using example values instead of measured or design data from the actual system.
- Accepting the result without checking safety factors, duty cycle, and manufacturer limits.
Fundamental equation: D=√(4Q/πv); Δp=[fL/D+ΣK]ρv²/2
Frequently asked questions
What is HVAC Duct Diameter, Velocity, Loss and Fan Pressure Calculator used for?
Calculate hvac duct diameter, velocity, loss and fan pressure calculator using engineering units and the defined formula. Use it for preliminary engineering sizing and independent result checks.
Which equation does this calculator use?
The calculation is based on D=√(4Q/πv); Δp=[fL/D+ΣK]ρv²/2. Inputs are converted according to the selected units.
Can the result be used as a final design value?
Results are for preliminary engineering evaluation. Verify assumptions, material data, safety factors, applicable standards, and manufacturer limits before final design. Confirm the result against the current standard, project specification, and manufacturer data.
