Exin CDCS Exam - Topic 1 Question 18 Discussion

Actual exam question for Exin's CDCS exam

Question #: 18
Topic #: 1

[All CDCS Questions]

What is a potential disadvantage of using water mist as a fire extinguishing system?

AIt only uses 10% of the water normally used in a water-based fire suppression, which might not be enough to suppress the fire

BIt will rapidly increase the humidity level in the data center, which can cause a potential risk for the operation of the equipment

CIt extracts oxygen from the air creating a potential risk for humans inside the computer room

DIt has droplets that are too small (100-120 microns) so it can only be used for small fires

Show Suggested Answer

Suggested Answer: B

A potential disadvantage of using a water mist fire suppression system is that it can rapidly increase the humidity within the data center, which may pose risks to sensitive electronic equipment. Excessive humidity can lead to condensation, which could damage electronics and lead to short circuits or corrosion over time.

Detailed Explanation:

Water mist systems use fine droplets to suppress fires by cooling and displacing heat. However, the moisture generated may raise the humidity level to the point where it exceeds safe operational limits for IT equipment. Therefore, while water mist systems are effective in fire suppression, they may not be ideal in environments where high humidity could damage sensitive equipment.

EPI Data Center Specialist References:

EPI guidelines advise considering the impact of humidity from fire suppression systems, particularly in environments housing electronic equipment. It's essential to weigh the benefits of fire suppression against potential risks to operational equipment when choosing suppression methods.

by Kirk at Jul 11, 2025, 11:52 AM

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Laurene

3 months ago

Small droplets might not be enough for bigger fires.

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Gerardo

3 months ago

Wait, it only uses 10% of the water? That seems risky.

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Staci

3 months ago

Totally agree, that could mess up the equipment!

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Laurel

3 months ago

Isn't extracting oxygen a bit extreme? Sounds dangerous!

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Kimberlie

3 months ago

I heard it can increase humidity levels in data centers.

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Davida

4 months ago

I feel like the humidity issue is a big concern, especially in data centers. I might go with B for that reason.

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Pansy

4 months ago

I practiced a question about the risks of oxygen displacement with water mist, so I’m leaning towards option C being a disadvantage.

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Fidelia

4 months ago

I’m not sure, but I think the small droplet size might limit its effectiveness on larger fires.

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Alison

4 months ago

I remember reading that water mist systems can actually increase humidity, which could be a problem for sensitive equipment.

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Allene

4 months ago

This is a tricky one. I'm not super familiar with the details of water mist systems, so I'll need to rely on my general fire safety knowledge to reason through the potential issues. I'll start by considering how the reduced water usage and increased humidity could impact the effectiveness and safety of the system.

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France

5 months ago

Okay, I think I've got this. The key here is to identify the unique characteristics of water mist that could be problematic in certain situations. The oxygen extraction and small droplet size seem like the most likely disadvantages to focus on.

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Rana

5 months ago

Hmm, I'm a bit unsure about this one. I know water mist systems use less water, but I'm not sure if that's necessarily a disadvantage. The humidity increase could be problematic, but I'll need to think through the potential risks more carefully.

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An

5 months ago

This seems like a straightforward question about the potential drawbacks of using water mist as a fire extinguishing system. I'll need to carefully consider each option and think about the key differences between water mist and traditional water-based systems.

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Lucy

7 months ago

I still think option A is the main disadvantage, as not having enough water can be a big issue in case of a fire.

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Jesusita

7 months ago

I feel like Option B is the way to go. No one wants to deal with a swamp in their data center, am I right?

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Meaghan

7 months ago

That's a good point, it could also be a potential risk for the equipment operation.

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Mari

7 months ago

Haha, Option D is just ridiculous. Small droplets? What is this, a fire extinguisher for ants?

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Ressie

6 months ago

A) It only uses 10% of the water normally used in a water-based fire suppression, which might not be enough to suppress the fire

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William

7 months ago

But what about the option B, about increasing humidity level in the data center?

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Rhea

7 months ago

Hmm, I'm leaning towards Option A. If it uses less water, that could be a potential issue for effectively putting out the fire.

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Vicki

7 months ago

I'm not sure about that. I think Option C might be the better choice. Reducing oxygen levels could create a dangerous situation for people.

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Twanna

5 months ago

But Option A mentions that it might not be enough water to suppress the fire.

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Chan

6 months ago

I think Option C might be the better choice. Reducing oxygen levels could create a dangerous situation for people.

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Lucy

7 months ago

I agree with Meaghan, that might not be enough to suppress the fire effectively.

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Ruthann

8 months ago

Option B is definitely the correct answer. Increased humidity in a data center can cause a lot of problems for the equipment.

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Aileen

7 months ago

B) It will rapidly increase the humidity level in the data center, which can cause a potential risk for the operation of the equipment

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Adrianna

7 months ago

A) It only uses 10% of the water normally used in a water-based fire suppression, which might not be enough to suppress the fire

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Meaghan

8 months ago

I think the potential disadvantage is that it only uses 10% of the water normally used in a water-based fire suppression.

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