1 m/s scenario
- Mean velocity
- 1 m/s
- Required area
- 100,000 mm²
- Equal-area round diameter
- 356.825 mm
VALICALC · TECHNICAL REFERENCE
Duct Velocity Reference
Compare authored duct velocity scenarios at your airflow, view the required area and round diameter, then use the chosen velocity in Duct Size.
ValiCalc · Duct Velocity Reference
https://www.valicalc.com/duct-velocity-chart
Dataset v1.2.0 · verified 2026-10-06
Print the selected answer, conditions, scope and source summary.
Display: metric. Airflow: 0.1 m³/s
SCENARIO MATRIX
Search within the verified subset. Numeric sizes match complete designations; a nearby size is a candidate, not an exact match.
SELECTED REFERENCE
3 m/s scenario
- Mean velocity
- 3 m/s
- Required area
- 33,333.333 mm²
- Equal-area round diameter
- 206.013 mm
All fields & cell provenance
- Velocity scenario: Duct area and airflow relationship — Authored scenario; continuity v=Q/A · verified 2026-10-06 · source value 3 m/s scenario.
- Mean velocity: Duct area and airflow relationship — Authored scenario; continuity v=Q/A · verified 2026-10-06 · source value 3.
- Required area: Duct area and airflow relationship — Authored scenario; continuity v=Q/A · verified 2026-10-06.
- Equal-area round diameter: Duct area and airflow relationship — Authored scenario; continuity v=Q/A · verified 2026-10-06.
v1.2.0 · verified 2026-10-06 · values use the valid conditions shown above
Use this value
Review the selected values and units in the calculator before applying them.
Use airflow and velocity scenario →3 m/s scenario3 m/sBack to answer ↑
Explore the verified data
7 matching rows · 7 in this subset
| Velocity scenario | Mean velocity | Required area | Equal-area round diameter | Actions |
|---|---|---|---|---|
| 1 m/s scenario | 1 m/s | 100,000 mm² | 356.825 mm | |
| 2 m/s scenario | 2 m/s | 50,000 mm² | 252.313 mm | |
| 3 m/s scenario | 3 m/s | 33,333.333 mm² | 206.013 mm | |
| 4 m/s scenario | 4 m/s | 25,000 mm² | 178.412 mm | |
| 5 m/s scenario | 5 m/s | 20,000 mm² | 159.577 mm | |
| 7.5 m/s scenario | 7.5 m/s | 13,333.333 mm² | 130.294 mm | |
| 10 m/s scenario | 10 m/s | 10,000 mm² | 112.838 mm |
2 m/s scenario
- Mean velocity
- 2 m/s
- Required area
- 50,000 mm²
- Equal-area round diameter
- 252.313 mm
3 m/s scenario
- Mean velocity
- 3 m/s
- Required area
- 33,333.333 mm²
- Equal-area round diameter
- 206.013 mm
4 m/s scenario
- Mean velocity
- 4 m/s
- Required area
- 25,000 mm²
- Equal-area round diameter
- 178.412 mm
5 m/s scenario
- Mean velocity
- 5 m/s
- Required area
- 20,000 mm²
- Equal-area round diameter
- 159.577 mm
7.5 m/s scenario
- Mean velocity
- 7.5 m/s
- Required area
- 13,333.333 mm²
- Equal-area round diameter
- 130.294 mm
10 m/s scenario
- Mean velocity
- 10 m/s
- Required area
- 10,000 mm²
- Equal-area round diameter
- 112.838 mm
KEEP THE JOB MOVING
Where does this result go next?
How to use this data
For entered Q, required area A=Q/v and equal-area round diameter d=√(4A/π). Use the selected velocity as a planning input; calculate straight-duct losses in Duct Size.
CHECK THE METHOD
Worked example
At 0.1 m³/s and 3 m/s, required area is 0.033333 m² and equal-area round diameter is about 206.01 mm.
REAL INPUTS · CLEAR METHOD
Practical worked examples
Illustrative scenarios using this page’s calculation or verified reference model. Change the assumptions for your own job.
0.1 m³/s airflow at a stated 3 m/s
Given
- Selected row
- 3 m/s scenario
- Airflow
- 0.1 m³/s
Calculation / lookup method
For entered Q, required area A=Q/v and equal-area round diameter d=√(4A/π). Use the selected velocity as a planning input; calculate straight-duct losses in Duct Size.
Result
- Mean velocity
- 3 m/s
- Required area
- 33,333.333 mm²
- Equal-area round diameter
- 206.013 mm
Required area follows Q/v and the displayed round diameter preserves area. The scenario does not prescribe an acceptable design velocity.
Open this reference scenario ↑0.2 m³/s airflow at 4 m/s
Given
- Selected row
- 4 m/s scenario
- Airflow
- 0.2 m³/s
Calculation / lookup method
For entered Q, required area A=Q/v and equal-area round diameter d=√(4A/π). Use the selected velocity as a planning input; calculate straight-duct losses in Duct Size.
Result
- Mean velocity
- 4 m/s
- Required area
- 50,000 mm²
- Equal-area round diameter
- 252.313 mm
Doubling airflow at the same velocity doubles area; diameter grows with the square root of area.
Open this reference scenario ↑0.5 m³/s airflow at 5 m/s
Given
- Selected row
- 5 m/s scenario
- Airflow
- 0.5 m³/s
Calculation / lookup method
For entered Q, required area A=Q/v and equal-area round diameter d=√(4A/π). Use the selected velocity as a planning input; calculate straight-duct losses in Duct Size.
Result
- Mean velocity
- 5 m/s
- Required area
- 100,000 mm²
- Equal-area round diameter
- 356.825 mm
A higher velocity changes the area requirement. Noise, fitting loss and fan selection are still project-specific checks.
Open this reference scenario ↑Continue the reference workflow
Common lookup questions
Can I use these values as a universal specification?
These are planning scenarios, not universal recommended velocity ranges. Noise, fittings, pressure loss, application and local requirements must be evaluated separately.
TRACEABLE DATA
Sources, scope & verification
Dataset v1.2.0
Last verified:
Seven authored comparison velocities, not prescribed limits for residential, commercial, acoustic or grease-exhaust systems.
Values are curated product facts or generated scenarios. Paid standards, complete catalogs and source diagrams are not reproduced. A verification date applies to this documented subset.
Duct area and airflow relationship ↗
Type A · Greenheck · Options, Accessories and Engineering, October 2021, ACC-34
Original generated scenarios from the stated equations; source tables/text/drawings are not reproduced.
Full provenance & artifact record
- Source checked
- 2026-10-06
- Use basis
- authored-formula
- Artifact SHA-256
- No retained source artifact hash; see the stated source and verification record.