High Efficiency Furnace No Outside Air Intake

I always tell people to pull from the exterior.

High efficiency furnace no outside air intake. Install manuals typically show both that way and wit h an outside air intake. Enerally permissible to install a furnace using indoor air for combustion no outside air intake. Due to high efficiency furnaceshaving their own fresh air intake no air is drawn from inside your home. First the gas byproducts can contain residual carbon monoxide that could leak back into your home unless the ventilation pipes are airtight.

Unfortunately the fresh air intake you have described is the second type and does not provide direct combustion air to the furnace room as it is directly connected to the return air plenum for. Since high efficiency furnaces draw air directly from outside the furnace itself does not require a fresh air intake in order to replace inside air that otherwise would have been drawn from the room the furnace is located in. High efficiency furnace combustion intake from inside or outside. Exterior combustion air draw eliminates the useless wasted time that you are now going through.