How much airflow does a powder booth need?

Open face × containment velocity, rated up for losses: 100 ft² at 75 ft/min needs 7,500 CFM at the face and an 8,333 CFM fan at 90% efficiency. Every slot and window counts.

What containment velocity does a powder booth need?

Commonly 60 to 100 ft/min inward at all openings, with the booth listing and your inspector setting the binding figure. Below the band powder drifts out; far above it airflow competes with deposition.

Can booth airflow hurt transfer efficiency?

Yes, and it is powder's distinctive trade: aggressive recovery airflow strips lightly charged powder off the part path and carries it to the cartridges. The symptom is falling efficiency with rising reclaim volume.

Why hold a cartridge-loading reserve?

Pulse cleaning restores cartridges only partway, so pressure drop ratchets upward between services and airflow falls with it. The reserve keeps the openings inward-flowing on the dirty days, not only on service day.

Finishing calculator

Powder Booth Airflow Calculator

Size a powder booth's recovery airflow to keep charged powder inside. Enter open face, containment velocity, clean-cartridge efficiency and a loading reserve.

What this calculator does

Recovery airflow for a powder booth from open face, containment velocity, system efficiency and cartridge reserve.

Formula used

Face airflow requirement = open face area × target containment velocity
Required fan rating = face requirement ÷ fan and filter efficiency
Loss allowance = required rating − face requirement
Rating with cartridge reserve = required rating × (1 + reserve)

Inputs explained

Booth Open Face Area: All openings: operator face, conveyor slots and part windows.
Target Containment Velocity: Inward velocity that keeps powder inside; 60 to 100 ft/min.
Fan and Filter Efficiency: Share of rated flow surviving fresh cartridges and duct.
Cartridge-Loading Reserve: Extra rating for pressure-drop climb between cartridge services.

How to use the result

Best suited to specifying a recovery fan for a new booth, re-rating containment after adding a slot, balancing containment against transfer efficiency.
NFPA 33 governs recovery design and recirculation; this page sizes only. A face-average velocity cannot see the plenum's balance at each opening. The transfer-efficiency interaction is flagged, not modeled.

Current U.S. benchmarks

Industrial electricity averages 9.77 cents per kWh across the U.S. (EIA, Jul 2026), up 4.7% from a year earlier. Energy-intensive steps carry this directly into unit cost.
The producer price index for industrial chemicals stands at 336.006 (BLS, Aug 2026), up 13.3% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).

Common questions

How much airflow does a powder booth need? Open face × containment velocity, rated up for losses: 100 ft² at 75 ft/min needs 7,500 CFM at the face and an 8,333 CFM fan at 90% efficiency. Every slot and window counts.
What containment velocity does a powder booth need? Commonly 60 to 100 ft/min inward at all openings, with the booth listing and your inspector setting the binding figure. Below the band powder drifts out; far above it airflow competes with deposition.
Can booth airflow hurt transfer efficiency? Yes, and it is powder's distinctive trade: aggressive recovery airflow strips lightly charged powder off the part path and carries it to the cartridges. The symptom is falling efficiency with rising reclaim volume.
Why hold a cartridge-loading reserve? Pulse cleaning restores cartridges only partway, so pressure drop ratchets upward between services and airflow falls with it. The reserve keeps the openings inward-flowing on the dirty days, not only on service day.

Last reviewed 2026-10-01.