DU0-001 · Question #139
Which rack accessory prevents exhaust air from being recirculated and entering equipment intakes?
The correct answer is C. Blanking panels. Blanking panels are flat plates installed in unused rack unit spaces to block airflow paths between the front (cool air intake) and rear (exhaust) of the rack. Without them, hot exhaust air recirculates back to the front and gets drawn into equipment intakes, raising operating…
Question
Options
- ACage nuts
- BVented shelves
- CBlanking panels
- DCable managers
How the community answered
(44 responses)- A14% (6)
- B5% (2)
- C75% (33)
- D7% (3)
Explanation
Blanking panels are flat plates installed in unused rack unit spaces to block airflow paths between the front (cool air intake) and rear (exhaust) of the rack. Without them, hot exhaust air recirculates back to the front and gets drawn into equipment intakes, raising operating temperatures and risking thermal damage. Cage nuts are mounting hardware used to secure equipment to rack rails. Vented shelves allow airflow through shelf surfaces but do nothing to prevent hot air recirculation between empty rack spaces. Cable managers organize and route cables but have no role in airflow control.
Memory tip: Think "blank the gap, block the heat" - blanking panels fill blank spaces to prevent hot exhaust from looping back to the front.
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