REHAU ECOIR SYSTEM ON THE EARTHS ENERGY:

The REHAU EC0AIRTM ground-air heat exchange system capitalizes on the relatively
constant ground temperatures found 5 to 7 feet (1.5 to 2 meters) below the earth’s
surface. Before entering a building’s indoor ventilation system, fresh air is pre-warmed
witfr , ground heat in winter, and pre-cooled with cooler ground temperatures in
summ’er. For example, in mid-latitude North America, where ground temperatures are
45F to 54’F (7″C to lz9), REHAU ECOAIR can assist in raising the intake air
temperature by up to 15″F (9’C) during colder months, and reducing it by up to 29’F
(15″C) in the
summer.