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Available in the 15- to 25-tonnage range, the new Trane® Foundation™ light-commercial rooftop units feature a dual-footprint design that can directly replace up to two-thirds of existing units without adaptor curbs. The company says the unit feature durable components that have been tested in the field, including a long-lasting tubular heat exchanger, reliable gas ignition system, and proven compressor technology. In addition, Trane Foundation rooftop units are certified to meet the most recent energy-efficiency standards established by ASHRAE.