Calculator Inputs
Enter room and storage details
Fields marked * are required.
Example Data
Sample scenarios for quick testing
| Scenario | Room (L×W×H) | Hazard | Storage | Strategy | Target ACH | Total Exhaust (m³/h) | Approx. Duct (mm) |
|---|---|---|---|---|---|---|---|
| Small cabinet room | 5×3×3 m | Flammable | Closed cabinets | General + local | ~7–9 | ~350–500 | ~200–250 |
| Open shelf storage | 7×5×3 m | Corrosives | Open shelving | General | ~7 | ~735 | ~250–315 |
| Handling drums | 10×6×4 m | Toxic/irritant | Drums | General + local | ~14–16 | ~3500–4200 | ~450–560 |
Values are indicative; use the calculator for computed outputs.
Calculation History
Last 0 saved run(s)
| Time | Units | Hazard | Storage | Strategy | Volume (m³) | ACH | Total (m³/h) | Total (CFM) | Duct (mm) | Fan (W) |
|---|---|---|---|---|---|---|---|---|---|---|
| No history yet. Run a calculation to save it here. | ||||||||||
History is stored in your browser session.
Formula Used
Core calculations behind the results
-
Room volume
V = L × W × H -
General dilution airflow
Metric: Q(m³/h) = ACH × V(m³)
Imperial: Q(CFM) = (ACH × V(ft³)) ÷ 60 -
Local exhaust airflow
Q_local(CFM) = points × per‑point CFM -
Total with safety factor
Q_total = (Q_general + Q_local) × (1 + safety%/100) -
Duct diameter from velocity
Area: A = Q ÷ v, Diameter: d = √(4A/π) -
Fan power estimate
P(W) = (Q(m³/s) × ΔP(Pa)) ÷ η
Defaults are practical design starting points. Always confirm requirements with local codes, project specs, and chemical safety data sheets.
How to Use
A quick workflow for consistent sizing
- Select your unit system for dimensions and flows.
- Choose hazard class and storage arrangement for defaults.
- Enter room dimensions to compute volume automatically.
- Pick a strategy and set safety factor for robustness.
- Optionally customize ACH, duct velocity, and pressure.
- Press calculate and export the report if needed.