Delta air-to-air heat exchangers use passive cooling through advanced fan and core design to provide effective thermal management with reduced energy consumption. Easy to install and maintain, Delta heat exchangers come in a variety of shapes and sizes with a multitude of standard and custom features. Internal, external and roof mount models are available with a range of cooling capacities, 10 to 230 W/K, and supply voltages 24 to 48VDC. Operating temperature range -10 to 65°C. UL, cUL, CE, TUV approved.