How drum-fan CFM sizing works
Volume, ACH, and when to stop at NO_MATCH.
Shop drum fan sizing
Drum fan CFM from room volume and air changes
Enter room length, width, height, and target ACH. Get the smallest 20, 24, or 30 in high-velocity drum-fan class — or NO_MATCH.
Shop drum fan sizing
Result
Required CFM ≈ (L × W × H × ACH) ÷ 60. Classes: 20 in / 4,800 · 24 in / 7,500 · 30 in / 12,000 CFM. ACH is a circulation shopping starting point — not an HVAC design. Above 12,000 → NO_MATCH.
From measurement to decision
Open the full calculator
Same tool with room for examples.
20 vs 24 vs 30 in classes
When each VEVOR drum-fan class fits — and when none do.
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