Author Question: What type of vent is used with 90 percent Category IV furnaces? A) Single-wall stainless steel ... (Read 54 times)

kshipps · **on:** Jul 24, 2018

What type of vent is used with 90 percent Category IV furnaces?

A) Single-wall stainless steel
B) Type B double-wall gas vent
C) 90 percent efficiency furnaces do not require a vent.
D) PVC

Question 2

Where is the refrigerant piping run from a rack system to the individual refrigerated cases?

A) Through an exterior wall
B) In trenches under the floor
C) Refrigerant piping is not necessary because rack systems are self-contained.
D) On top of the floor under a protective metal cover