Most automatic temperature control doors are typically operated by which of the following methods? a Hydraulic units b. Vacuum actuator C. Electric actator d. Mechanical cable Aavaniage EAT, 3e Heating and Alr comur uv Quiz navigation BH Brian Hall Finish attempt

## Step 1<br />The problem is asking us to identify the typical method used to operate automatic temperature control doors. The options provided are hydraulic units, vacuum actuator, electric actuator, and mechanical cable.<br /><br />## Step 2<br />The correct answer is vacuum actuator. This is because vacuum actuator systems are commonly used in automatic temperature control doors. These systems use vacuum pressure to move the door, which allows for precise control of the door's position.<br /><br />## Step 3<br />Vacuum actuator systems are preferred because they are reliable, energy-efficient, and can be easily controlled. They are also less likely to fail compared to other methods such as hydraulic units, electric actuator, or mechanical cable.