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02-25-2008, 07:00 PM #1
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.
02-25-2008, 07:36 PM #2
Not an issue in my book. If you put a divider in that platform, the air pressures are still there to do the same thing. YOU might feel better about it, but the effect on the system would be negligible.
If the return plenum is sized correctly there should be enough air to satisfy both units when running and therefore twice as much when one is off. Even pulling air back through the supply vents would not be detrimental.
I would be more concerned with the combustion air, ensuring that there is enough, and that it is seperate from the return air.
02-26-2008, 08:08 AM #3
I would call it out for the above reasons.
You might want to call the HVAC manufacturer to see if they could give their blessing on a system like this.
Scott Patterson, ACI
Spring Hill, TN