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Difficulty: MediumPhysical Security Controls and Environmental Measures

A network administrator is overseeing the construction of a new network closet situated directly adjacent to a light manufacturing area that produces significant airborne dust and debris. Which environmental control should be configured for the network closet's HVAC system to prevent dust from entering the room when personnel open the entry door?

  1. Maintain positive air pressure inside the network closet relative to adjacent spaces.Answer
  2. B
    Maintain negative air pressure inside the network closet relative to adjacent spaces.
  3. C
    Increase relative humidity levels inside the closet above 80% to settle airborne particles.
  4. D
    Deploy a dedicated wet-pipe sprinkler system directly inside the HVAC supply ductwork.

Answer

Maintaining positive air pressure inside the network closet relative to surrounding areas ensures air flows outward when doors open, preventing airborne dust and debris from entering.
Maintaining positive air pressure inside a network closet creates a higher atmospheric pressure within the room compared to adjacent spaces. When the door to the closet is opened, air naturally flows outward into the hallway or manufacturing area, effectively creating an air barrier that prevents airborne dust and debris from entering sensitive network equipment areas.

Step-by-Step Solution

1
Analyze the environmental threat described in the scenario.
The primary threat is airborne dust and particulate intrusion from the adjacent manufacturing floor whenever the door opens.
Dust accumulation on network devices can impair cooling fans, cause overheating, and lead to component failure.
2
Evaluate HVAC airflow pressure differential options.
Positive air pressure keeps internal pressure higher than external pressure, forcing clean air outward through doorways and gaps.
Negative pressure would draw unfiltered air and dust inward into the equipment space.
3
Select the appropriate environmental control mechanism.
Configuring HVAC systems for positive air pressure mitigates particulate contamination while preserving proper equipment operating conditions.
Positive pressure directly addresses the risk without introducing unwanted moisture or liquid hazards.

Key Concept

HVAC Air Pressure Differentials and Environmental Contamination Control
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Topics

Physical Security Controls and Environmental Measures

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