An alternative to belt-driven energy recovery ventilators (ERV) is the GreenCube™, an energy recovery ventilator that, except for the air movers, has no moving parts. It is an enthalpy plate energy exchanger that recovers both sensible (heat) and latent (moisture) energies from one airstream and transfers it to another.
Although the project had to be redesigned more than once, the Almost Home Animal Shelter in Fort Dodge, Iowa, has now been efficiently operating for more than a year with a dedicated outdoor air system (DOAS) and an integral energy recovery wheel.