What is the primary purpose of installing air curtains at a delivery entrance?

• A. Eliminate dust
• B. Block insects completely
• C. Reduce energy use
• D. Improve lighting

Answer: (A)

Air curtains create a fast-moving air barrier across an open doorway, so when the delivery door is used, outside dust and debris are kept from drifting into the building. That barrier is focused on keeping dust out, which is why reducing or preventing dust is the best way to describe the primary purpose. While the curtain can also help cut down on energy loss by limiting air exchange and isn’t a guarantee for insect exclusion or lighting improvement, its main job here is to keep dust from entering as the door opens.