1. 

   Deuce Member

   My installer said they normally remove the large filters at the unit since I have filters at my air returns.
   I don't want to cause the unit to work harder than it has too. I have 2 WaterFurnace 5 series.
   Thanks

    

   Deuce, Dec 3, 2018

   #1
2. 

   nc73 Member Forum Leader

   You either use one or the other. Two might restrict flow if both are used.

    

   nc73, Dec 4, 2018

   #2

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