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Before doing any of this pull the inside cover off of your existing units and check the baffle. Since both the output and return share a common 14x14 opening the airflow is kept separate by a fiberboard baffle. These things are just friction fit in the housing and many are displaced. Mine was nearly horizontal having been displaced by the wiring. After straightening it up and securing it with metal duct tape the in and out air flow is 100% isolated. It made a HUGE difference in the overall effectiveness. Only takes a few minutes and it’s a good time to clean your filters as well.
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