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Roof Top Units and DDC Controls <br />•Roof Top Units are identified on the Non-Fleet Capital <br />Replacement Program <br />•Pneumatic Controls should be replaced as part of this <br />project <br />•ASHRAE – American Society of Heating, Refrigerating, <br />and Air-Conditioning Engineers Life Expectancies <br />•Roof Top Units – 15-20 Years <br />•Pneumatic Controls – 20 Years