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The CITY MULTI L- Generation Air-Source outdoor units has improved efficiency ratings due to HexiCoil technology, a zinc-aluminum flat tube heat exchanger that maximizes heat transfer capability through its fin shape. Increased efficiencies across all categories make this outdoor unit ideal for projects with efficiency goals such as LEED certification or net zero status. The HexiCoil product, along with its zinc outer coating, provides water shedding capability and corrosion resistance, prolonging the outdoor unit’s lifespan. Other enhancements include: 30 percent smaller footprint, making the system ideal for projects with tight mechanical spaces; up to 50 percent reduction in system refrigerant charge, for improved flow distribution; improved high-ambient cooling operating range or up to 126 F; improved vertical separation between indoor units within the same heat recovery system — a distance of up to 98 feet — expanding design options. Mitsubishi Electric.