Quote:
Originally Posted by SuzanneH
Yes, there is a duct. The air has to have somewhere to move to in order to optimally heat an area. A return (or in this case, the gaps in the stairs) allows that to happen.
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I’m sorry to disagree, there is certainly a return/fresh air intake, but there is no physical connection to those step grilles. The furnace will use more readily available air before it pulls anything through the grilles. They can only be a forced return if the furnace runs long enough to pressurize the cabin.
Mark