Is it OK to share the return air compartment of 2 FAG furnaces? Both units have seperate returns, filters, thermostats, and supplies. They are set up to run independently and cool the East and West side of the home. They are next to one another on a raised platform--should there be a panel inthe return compartment inside the platform isolating the return so air can not be pulled from the supply of one unit when it is not in use and vise versa? Could the cage of the off unit turn backwards when the other unit is running? Seems like an issue.
DAC

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dominic caronna