Author Question: A direct-fired make-up air unit typically achieves a combustion efficiency of _____. a. 70 ... (Read 13 times)

fahad · **on:** Jul 24, 2018

A direct-fired make-up air unit typically achieves a combustion efficiency of _____.

a. 70 percent
b. 80 percent
c. 90 percent
d. 100 percent

Question 2

The discharge air setpoint of a direct-fired make-up air unit is usually _____.

a. about 25F below the desired room temperature
b. at or slightly above the desired room temperature
c. at least 25F above the desired room temperature
d. at least 40F above the desired room temperature