Spray booths and curing ovens exhaust large volumes of heated air, often loaded with overspray, solvents, or moisture. Replacing that air with conditioned make-up air is expensive. Coating booth heat recovery captures the heat without mixing contaminated exhaust back into the supply.
Why Separation Matters
Exhaust from painting contains VOCs and particulate overspray. Cross-contamination is unacceptable, so plate exchangers and heat pipes are preferred over rotary wheels.
Typical Configuration
- Exhaust passes through a primary filter then the recovery core.
- Supply (make-up) air is pre-heated by the core before the burner/coil.
- A bypass allows 100 % fresh air during spray mode if required by code.
- Solvent-resistant coatings protect the core in aggressive booths.
Benefits
- 30–60 % reduction in make-up air heating energy.
- Smaller burner or heater capacity.
- Faster booth warm-up after idle periods.
- Lower NOx and CO2 from reduced combustion.
Safe recovery in a spray booth starts with separation and continues with compliant controls. Keep the exhaust core downstream of the booth filters and any thermal or catalytic oxidizer so solvents never reach the supply side. Where the process is in an explosion-risk zone, select equipment and wiring to the applicable area-classification rules and confirm purge airflow meets the fire code. Size the make-up air unit to the booth demand so the exhaust and supply stay balanced and the room stays slightly negative to surrounding spaces. A demand-based strategy that scales recovery to spray activity avoids overheating during idle periods. See our heat recovery solutions for booth-rated, solvent-resistant cores.
Frequently Asked Questions
Is this safe with solvent exhaust?
Yes, provided a sensible-only, non-cross-flow design is used and purge/bypass meets local fire codes (e.g., NFPA 33).
Do I need special materials?
For acidic or solvent-heavy exhaust, stainless steel or epoxy-coated aluminum cores are recommended.