Why don't variable-air-volume zone systems need any method of controlling excess air?
A) Any excess air is automatically diverted outside.
B) All the dampers pass a little air, even when they are closed.
C) They reduce the system airflow to match the number of zones calling.
D) The fans used are not capable of producing excess air.
C
You might also like to view...
Which of the following is the primary cause of corrosion in ferrous piping systems?
A) Alkalinity. B) Oxygen. C) Calcium salts.
Unusual or rare plants are called exotic plants
Indicate whether the statement is true or false.
Receptacles that are installed to meet NEC® Section 210.52 placement requirements are not permitted to be more than __________ feet above the floor.
a. 4.5 b. 5 c. 5.5 d. 6
Sketch a histogram for which
a. the mean is greater than the median. b. the mean is less than the median. c. the mean is approximately equal to the median.