What is the difference between a 90 percent furnace with a sealed combustion system and a typical 90 percent furnace?
Select one:
A. Sealed combustion units use household vented air for combustion.
B. Sealed combustion units require combustion air to be piped in from the outside.
C. Sealed combustion units may use PVC pipe for venting material.
D. Sealed combustion units do not produce any combustion products.
Answer (2)
A sealed combustion furnace draws air for combustion from the outside, preventing the use of indoor air, and safely vents combustion products outside. This system enhances efficiency and indoor air quality, using materials like PVC for venting. Ultimately, these furnaces have significant advantages over typical models. ;
A sealed combustion furnace draws air from outside for combustion, while a typical furnace may use indoor air. This design improves efficiency and safety, as all combustion products are vented outside instead of entering the home. The correct choice is B: Sealed combustion units require combustion air to be piped in from the outside.
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