Bosch BIVA-60RXB-M15X 60,000 BTU Multi-Position Air Handler Indoor Unit - R454BBosch BIVA 60RXB M15X 60,000 BTU R 454B Multi Position Air Handler The Bosch BIVA 60RXB M15X is the largest capacity air handler in the IDS Light Series, designed for powerful whole home comfort. Built for performance, flexibility, and durability, it pairs seamlessly with Bosch IDS Light outdoor units to deliver efficient heating and cooling year round. Efficient & Flexible Operation Delivers 54,000 BTU of nominal cooling and 56,000 BTU of heating