High Efficiency Furnace No Outside Air Intake

Install manuals typically show both that way and wit h an outside air intake. A high efficiency condensing furnace if not properly ventilated can present two safety hazards. Generally you can pull combustion air either from the interior or exterior.

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Exterior combustion air draw eliminates the useless wasted time that you are now going through.

High efficiency furnace no outside air intake.

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. Due to high efficiency furnaceshaving their own fresh air intake no air is drawn from inside your home. 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. Enerally permissible to install a furnace using indoor air for combustion no outside air intake.

High efficiency furnace combustion intake from inside or outside. First the gas byproducts can contain residual carbon monoxide that could leak back into your home unless the ventilation pipes are airtight. I always tell people to pull from the exterior. See reference 2 in a sealed combustion system as high efficiency furnaces are designed to be outdoor air is essential since the system does not draw any air from inside of the house.

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