The industrial equipment you're seeking is called an economizer. It rigs up to the return air plenum and reroutes the intake to your choice of supply. An economizer can also be rigged to exhaust stale air outdoors. Some economizer units come with their own differential controllers that make all the decisions and tell the units what to do and when. Or you can go with a zone damper, but they are usually controlled by a separate device.
Last edited by jeff5may; 04-14-14 at 07:01 PM..
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