What is the most common refrigerant used in large food processing plants?
A) HFC-404A B) Ammonia C) CFC-12 D) R-410A
Question 2
One advantage of rooftop units on small commercial buildings is that
A) they are easier to service than systems located inside the building
B) they operate more efficiently than systems located inside the building
C) they are available in larger capacities than central station systems
D) they offer a substantial savings of space within the building