Why Counterflow

In a counterflow core the streams run in opposite directions, so the cold outgoing air meets the coldest part of the incoming stream. This squeezes out more energy than crossflow - typically 70 to 75 percent versus 60 to 65 percent sensible.

Customization Levers

• Plate spacing - tighter spacing raises area but also pressure drop
• Pass arrangement - number of counterflow passes and port layout
• Material - aluminium, polymer, or coated foil per duty
• Core depth - deeper core at lower face velocity lifts effectiveness
• Port size and position - match the AHU ductwork

When to Customize

Custom counterflow cores suit passive-house, low-temperature heating, or tight space where every point of effectiveness counts. For standard commercial jobs, a stock crossflow core is usually sufficient.

Verify

Confirm the customized core rating at your face velocity, not the catalogue nominal, and check the pressure drop against the fan.