Up to 157 cub-ft/min air flowHigh-efficiency heating-energy recoveryPrefilters air for reduced indoor air pollutantsCrossflow configuration ensures there is no mixing of stale, outgoing and fresh, incoming airCrossflow, polypropylene coreCapable of intermittent- or continuous-mode operationAutomatic defrost cycles for operation below 23 deg FEasy "no tools" maintenanceAcoustically engineered for quiet operationUp to 78% at 32 deg F heating recovery efficiency (ASE)Quiet operationCore protection filters on incoming and outgoing airInfinity® or separate ventilator controls recommendedHeavy-gauge steel cabinetsPowder-coat painted in taupe metallicHinged doors core access