<http://schema.org/about>
"It is a closed circuit that takes the moisture and heat out of the exhaust air and recirculates it."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/sustainable-product-design/heat-pump-dryer-may-be-answer-energy-crisis-our-laundry-room.html>