Question

a(n) ___ °f temperature difference from the inside to the outside of the duct is considered the maximum difference allowable before insulation is necessary.
10
15
18
20
question 4 (1 point)
the main drawback of the extended plenum system is that the velocity of the air is lower as the air reaches the last takeoffs on the extended plenum.
true
false

Explanation:

For the first question, in HVAC - related knowledge, a 18°F temperature difference from the inside to the outside of the duct is often considered the maximum allowable before insulation is necessary. For the second question, in an extended plenum system, due to pressure drops and air - flow distribution, the air velocity is indeed lower at the last takeoffs on the extended plenum.

Answer:

1. C. 18
2. True