I had made a couple of duct mounted exhaust grills that I could attach to a duct tap...thinking logically, I told the airflow direction on the connector that it was "in" instead of "out", since the exhaust system pulls in air instead of distributing it. After placing the part in a project in RMEP 2011, I discovered I could not connect it to a system...it would show up under the default exhaust system, but would never let me define an exhaust system. After several head scratching attempts that served only to contributing to my bald spot, I changed the connector back to "out"...reloaded the family, and "voila" - I can create the exhaust system.
One more note - when I tried to add my Loren Cook fan to the system it wouldn't let me - until I changed the connector to Bidirectional (an extra option that's available with duct connectors in equipment, but not in air terminals).
Check 'em both...
Hope you haven't run across this...but the logic defies me...
later - David B.
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