Paint Booth & Spray Booth Exhaust Air-to-Air Heat Recovery

Paint Booth & Spray Booth Exhaust Air-to-Air Heat Recovery

A paint or spray booth exhausts large volumes of warm, VOC-laden air that must be balanced by conditioned make-up air. Venting that warmth outdoors wastes the energy spent heating (or cooling) the booth. An air-to-air heat exchanger between exhaust and make-up air pre-conditions the incoming air for free, cutting booth heating cost without compromising finish quality.

Why Booths Lose So Much Energy

A typical booth runs 20,000–60,000 m³/h of exhaust at 25–40°C. In winter that is a continuous, large heat drain. Recovering 60–80% of the sensible heat through a fixed core returns most of it to the make-up air, so the heating system only supplies the remainder. Our efficiency reference shows how effectiveness converts directly into fuel saved.

Plate Core vs Rotary Wheel in a Booth

Spray-booth exhaust carries overspray, solvents, and particulates — and cross-contamination is unacceptable (you must not pull booth exhaust back into the supply that feeds the operators and the finish). A fixed plate exchanger keeps the two streams fully separated, with no motor and no carry-over. A rotary wheel would bake overspray onto its matrix, breed fire and maintenance risk, and leak exhaust into supply. Both our rotary vs plate comparison and the field guide where wheels are banned point the same way: for booths, use a plate (or heat-pipe) core, never a wheel.

System Layout

1. Fit a pre-filter and, where required, an abatement stage upstream of the core so it sees cleaned air.
2. Route exhaust through one side, make-up air through the other (counter-flow plate for best effectiveness).
3. Add a summer bypass for when no heat recovery is needed.
4. Size the make-up fan for the core pressure drop — see pressure-drop reference.

Material Choice

Solvent and overspray can be corrosive; stainless or coated aluminum plates are typical. The full trade-off is in our material selection guide. For highly aggressive exhaust, PP polymer plates resist the chemistry.

What to Specify

Related

See also our kitchen exhaust recovery and application library.

Get a Booth Core

We build corrosion-resistant plate cores for paint and spray booths, sized to your airflow and VOC duty. For drawings and a quote, contact +86 15753355505.