A project installation detail requires the bottom of an outdoor unit to be 24 inches above its reference surface. The installed bottom is 18 inches above that surface. How much additional height is required?
- A18 inches
- B24 inches
- 6 inches
- D42 inches
Where to look it up
Explicit exercise assumptions; not a universal code requirement.
Why C is correct
24 − 18 = 6 inches. This checks the supplied project detail; it does not impose a universal two-foot mounting requirement.