The RT135 Rooftop System provides heating and air conditioning for large school buses, cutaways and coaches. Roof-mounted and designed for efficiency, it features three 14-inch fans delivering 3,200 ft³/min (5,436 m³/hr) airflow at 0 static. With 86 A @ 12 VDC or 43 A @ 24 VDC and cooling from 95,000 BTU/hr (SAE) to 152,000 BTU/hr (IMACA), the RT135 combines durability and high performance in a compact design built to meet the demands of modern transit fleets.