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Energy recovery is becoming more of an essential part of today's HVAC solutions in buildings. Frost accumulation inside heat and energy recovery devices is among the biggest challenges that face energy/heat recovery ventilators. In climates with severe winter conditions, frost build-up may block the airflow channels of energy exchangers. This creates additional air pressure drop and may potentially damage the device or reduce indoor air quality. Frost control must be taken into consideration when designing and specifying an energy recovery device in certain climates. This session addresses strategies to avoid frost accumulation and common defrost strategies across the industry.