With regard to hot water heat coil installation, which of the following is not an important factor in prevention of coil freeze-up?
a. Air must be continually vented from the coil, before and during service
b. The air velocity should exceed 10 m/s
c. The water temperature should be maintained at a reasonably high pre-set temperature
d. The water velocity should exceed 0.9 m/s
e. A constant flow of water should be fed to the coil
Answer: B