Author Question: Rooftop units can have the ductwork connected to either: A) The bottom or side of the unit. B) ... (Read 166 times)

frankwu · **on:** Jul 24, 2018

Rooftop units can have the ductwork connected to either:

A) The bottom or side of the unit. B) The top or side of the unit.
C) The main unit or a satellite blower coil. D) The bottom or top of the unit.

Question 2

The difference between 80 percent efficiency furnaces and 90 percent efficiency furnaces is that 90 percent efficiency furnaces:

A) Use more combustion air per 1,000 BTU firing rate.
B) Have an extra recuperative heat exchanger that condenses water out of the flue gas.
C) Burn more gas to increase the heat exchanger temperatures.
D) Use more efficient air filters.