Author Question: Why are the 90 percent condensing furnaces unique? A) The flue gas affects the venting material ... (Read 67 times)

ericka1 · **on:** Jul 24, 2018

Why are the 90 percent condensing furnaces unique?

A) The flue gas affects the venting material at a greater-than-normal rate.
B) The venting of this type of furnace is made of PVC and is easy to seal airtight.
C) The flue gas is excessively hot and can cause fires if improperly used.
D) The venting material is rare, as it is no longer manufactured due to defects.

Question 2

The most common fan used for moving air across outdoor condenser coils in residential air conditioning is:

A) Vane axial. B) Propeller.
C) Backward-curved centrifugal. D) Forward-curved centrifugal.