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Fred, The return air temp is the same as the zone's air temp (output ntype 1). If you need the flow, that would typically be the same as your supply flow (if any), unless you're assuming the space is pressurized (or, at least, you have no return fans) and/or there are exfiltration losses. Then it's not so simple... --
Cramer Silkworth 212 219 2255 | silkworth@transsolar.com Transsolar Inc. | 134 Spring Street Suite 601 | New York, NY 10012 Transsolar Climate Engineering Technical consulting for energy efficiency and environmental quality in buildings. New York - Stuttgart - Munich |