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Re return vent B which is in the ceiling next to the door to the garden, when the door is openned will the ruturn not draw all its air from the outside thereby increasing infiltration of airborne...

I have had 2 Carrier 48XP Electric Cool / Gas Heat 3 ton package systems installed as a retrofit on the flat roof of my one level home. The install splits the house into two zones ( A & B) of approx...