Factors affecting a humidifier's performance include which of the following? 1. Surface area 2. Temperature 3. Time of contact 4. Outlet size

a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only

ANS: B
The following four variables affect the quality of a humidifier's performance: (1) temperature, (2) surface area, (3) time of contact, and (4) thermal mass.