The main function of air distribution devices is to introduce supply air into the conditioned space. This is accomplished by using which of the following methods.
1. diffusion
2. induction
3. entrainment
4. aspiration
a) 1,2,3,4
b) 1,2,3
c) 2,3,4
d) 1,3,4
e) 1,2,4
Answer: A