DERV units represent a significant advance in ventilation technology for residential and light commercial premises. The purpose designed units are ideal for ventilating spaces subject to climates which are characterised by both high temperatures and high humidity levels.

The full range of units utilise energy efficient heat pipe technology to minimise the cost of ventilation while allowing designers and users to maintain the ventilation rates which are necessary for comfortable occupation.

DERV units take advantage of the cooling capacity of waste, extract air to absorb heat from high temperature ventilation air before treating this air to remove moisture in a cooling coil. This cooling coil incorporates another heat pipe to further precool the air and minimise the cooling load. Furthermore, the heat pipe reheats the overcooled air to reduce relative humidity and provide comfortable supply air ready for distribution directly to the occupied spaces.