FieldengThermal & HVAC
Duct Airflow from Geometry
Airflow from measured velocity and rectangular or round duct size. Circular pipe continuity is also FLUID-01.
Thermal & HVACFluid & Pressure
Airflow from measured velocity and rectangular or round duct size. Circular pipe continuity is also FLUID-01.
App id: THERM-02. Reference version 1.0.
How to fill it
Fill the inputs. The tool shows the outputs.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
Q = v W H or Q = v π D² / 4Inputs
| Name | Unit |
|---|---|
| Air velocity (camera) | ft/min |
| Width (optional) | in |
| Height (optional) | in |
| Diameter (optional) | in |
Outputs
| Name | Unit |
|---|---|
| Airflow (hero result) | ft3/min |
| Area | m2 |
Diagnose
Observations are context. They do not pass or fail a structure. See Diagnose.
| When | Observation | Severity |
|---|---|---|
Air velocity < 0.3 | Low velocity | info |
Air velocity > 5 | High velocity | caution |
Air velocity > 3 | Elevated velocity | info |
Assumptions
- Inside dimensions. No fitting or leakage correction.
Provenance
- Same continuity as THERM-01 with geometry required. FLUID-01 is the circular-pipe form.