Most plate cores are aluminum, but stainless and polymer variants exist. The choice is driven by corrosion, weight, and cleaning needs.
Comparison
| Aluminum | Stainless steel | |
|---|---|---|
| Thermal conductivity | Excellent | Good |
| Weight | Light | Heavier |
| Corrosion resistance | Good (coated) | Excellent |
| Cleanability | Good | Excellent (aggressive CIP) |
| Cost | Lower | Higher |
Choose aluminum
For typical HVAC exhaust (moderate humidity, no acids), coated aluminum gives the best conductivity-to-cost ratio.
Choose stainless
For kitchen hoods, laboratories, or corrosive industrial exhaust, stainless survives where aluminum would pit.