Why a Wheel

A rotary wheel is a slowly spinning matrix that can reach 80-85 percent sensible effectiveness and 70-80 percent latent (enthalpy) effectiveness - the highest of any air-to-air device. It also recovers moisture, which matters in humid climates.

Key Selection Parameters

• Wheel diameter and depth - deeper media holds more energy per rotation
• Media type - aluminium (sensible) or molecular-sieve coated (enthalpy)
• Rotation speed - set so the wheel spends enough time in each stream
• Seal quality - better seals mean less stream carryover

Sizing Approach

Define the required sensible and latent recovery, then select wheel size and speed to meet both at your design airflow. Because a wheel is compact for its capacity, it suits large air-handling units.

Watch-outs

• Slight carryover between airstreams - avoid in strict containment zones
• Motor, seals, and bearings need a maintenance plan
• Summer bypass is needed when no recovery is wanted

Verify

Check the certified effectiveness (Eurovent or AHRI 1060) at your operating point, not the headline number.