Polybloc Accubloc

Accubloc® works by alternately charging and discharging the dual energy storage Banks.
During one period the return Air flows through the front section of the damper and warms front bank. Meanwhile the outside Air flows through the rear bank where it picks up heat previously stored there, which warms the Supply air.
After bank B releases most of its heat, the dampers switch and the outside air flows through the heated bank