Paint Booth & Spray Finishing Ventilation

Extraction and supply air for spray finishing, where the airstream carries solvent vapour and overspray — and where explosion-protected construction is a legal requirement, not an upgrade.

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WhatA booth is an airflow design, not a box

A spray booth works by moving air past the operator and the workpiece fast enough to carry overspray and solvent vapour away before either can accumulate. Downdraught, semi-downdraught and crossdraught layouts differ in where the air enters and leaves, but all of them are specified on face velocity through the working opening rather than on the volume of the enclosure.

WhoWho buys it

Vehicle refinishing shops, furniture and joinery finishers, metal fabrication and powder-coating lines, aerospace and rail maintenance facilities, and the booth manufacturers and installers who build for them.

WhyWhy the atmosphere classification comes first

Solvent vapour inside a booth forms an explosive atmosphere, so the extract fan sits in a classified zone. That is not satisfied by an “explosion-proof motor” alone: the impeller and housing must be non-sparking, the bearings protected, and the whole assembly certified for the zone it sits in. Fitting a standard fan to a solvent extract duct is the single most dangerous mistake in this scenario, and it is also the most common.

HowBalancing extract against supply

Set the required face velocity across the booth opening — this is normally fixed by the regulations applying to you. Multiply by the opening area to get the extract volume, then size the fan against the real system resistance: filters at both intake and exhaust, plus the discharge stack, add substantial static pressure and their resistance rises as they load. Supply air must be filtered, tempered and matched to extract, or the booth pulls dirty workshop air in through every gap and ruins the finish.

Equipment this application needs

Centrifugal Fans Extract fans Centrifugal Fans702 Backward-curved impellers hold volume as filters load; explosion-protected construction where a classified zone applies. Axial Flow Fans Supply air Axial Flow Fans672 High volume at low resistance for the filtered make-up air the booth needs. Heat Exchangers Air tempering & recovery Heat Exchangers362 Heating make-up air to a workable spray temperature is the dominant running cost — recovery pays back quickly. Blowers Process & drying air Blowers411 Curing and blow-off duties around the finishing line. Ventilation Fan Parts Spares & drives Ventilation Fan Parts101 Belts, pulleys and motors — booth fans run every production hour and wear predictably.

What to check before you order

Explosion Proof 195
Mandatory in the classified zone. Covers impeller and housing materials, not just the motor.
Corrosion Resistant 154
Solvents and paint residue attack standard coatings.
Variable Speed 72
Lets extract follow spray and flash-off cycles instead of running flat out all shift.
Industrial Grade 977
Continuous production duty with serviceable bearings.
380V 1,427
Three-phase supply for booth-scale fan sets.

Products for this application

Questions buyers ask

Does a paint booth fan have to be explosion-proof?
Wherever the fan handles an airstream that can contain flammable solvent vapour, yes — and the requirement covers the whole assembly, not only the motor. A certified motor bolted to a standard steel impeller is not compliant, because the spark risk is impeller-to-housing contact. Classify the zone first, then select a fan certified for that category.
How much extract air does a spray booth need?
It follows from the face velocity required across the working opening multiplied by the area of that opening, not from the booth’s volume. The required velocity is set by the regulations that apply to you and by the booth type; once fixed, the fan must deliver that volume at the system’s actual static pressure, including loaded filters.
Why does the booth need supply air as well as extract?
Because air removed has to be replaced. Without a matched, filtered supply the booth draws unfiltered workshop air through every gap in the structure, which contaminates the finish and makes the extract system underperform. Supply is normally 80–90% of extract so the booth stays slightly negative.

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