Author Question: To minimize air noise, the face velocity of the air leaving a supply register should be kept: A) ... (Read 63 times)

Tazate · **on:** Jul 24, 2018

To minimize air noise, the face velocity of the air leaving a supply register should be kept:

A) Over 1,000 ft per minute. B) Under 1,000 ft per minute.
C) Over 600 ft per minute. D) Under 600 ft per minute.

Question 2

Before starting to change a belt on a belt drive blower, the technician should:

A) Put on heavy work gloves in case the unit is inadvertently started while changing the belt.
B) Turn the power to the unit off and lock it out.
C) Turn the thermostat off and leave instructions not to turn it on.
D) Wedge a metal bar between the pulley and the unit housing to prevent it from starting.