Direct Answer

Clean agent enclosure hold time can be estimated using an assumed leakage rate for preliminary assessment. In this example, the adjusted hold time is 202.02 minutes, exceeding the required 10 minutes. Final compliance must be confirmed by an approved door fan test.

At a Glance

Protected Volume	V | 518.4 | m³
Estimated Leakage Rate	L | 0.45 | %/min
Required Hold Time	Hr | 10 | min
Safety Factor	SF | 1.10 | –
Engineering output	Adjusted Hold Time: 202.02 min Required Hold Time: 10 min Status: COMPLIES
Use limitation	Preliminary estimate; final verification as stated in source

Calculation Method & Worked Example

Estimated Hold Time = 100 ÷ Leakage Rate

Adjusted Hold Time = Estimated Hold Time ÷ Safety Factor

Estimated Hold Time = 100 ÷ 0.45 = 222.22 min

Adjusted Hold Time = 222.22 ÷ 1.10 = 202.02 min

Applicable Standards Listed in the Source

Standard	Description
NFPA 2001	Clean Agent Fire Extinguishing Systems
ISO 14520	Gaseous Fire Extinguishing Systems
NBC India Part 4	Fire & Life Safety
OEM Guidelines	Door fan test and enclosure integrity

Technical Content

1. Purpose

To perform a preliminary verification of clean agent enclosure hold time using a simplified leakage model prior to a formal door fan integrity test.

2. Engineering Objective

To estimate whether the protected enclosure can retain the extinguishing concentration for the required hold time under assumed leakage conditions.

3. Applicable Standards

Standards are listed above as supplied in the source document.

4. Design Inputs

Protected Volume | V | 518.4 | m³; Estimated Leakage Rate | L | 0.45 | %/min; Required Hold Time | Hr | 10 | min; Safety Factor | SF | 1.10 | –

5. Assumptions

A constant leakage rate is assumed for preliminary assessment. Actual hold time shall be established by an approved door fan test.

6. Formula(s)

Estimated Hold Time = 100 ÷ Leakage Rate

Adjusted Hold Time = Estimated Hold Time ÷ Safety Factor

7. Variables Explained

V = Protected volume; L = Leakage rate; Hr = Required hold time.

8. Step-by-Step Calculation

Estimated Hold Time = 100 ÷ 0.45 = 222.22 min

Adjusted Hold Time = 222.22 ÷ 1.10 = 202.02 min

9. Worked Engineering Example

A room with an assumed leakage rate of 0.45% per minute provides an adjusted estimated hold time of 202.02 minutes, exceeding the required 10-minute retention period.

10. Engineering Output

Adjusted Hold Time: 202.02 min

Required Hold Time: 10 min

Status: COMPLIES

11. Design Considerations

Seal cable penetrations, doors, dampers and service openings. Verify HVAC shutdown and perform a door fan test before acceptance.

12. Common Design Mistakes

Ignoring leakage paths, omitting door fan testing, assuming hold time without verification.

13. Practical Site Notes

Complete all construction work before enclosure integrity testing and document any leakage remediation.

14. Limitations

This is a simplified engineering estimate and does not replace an approved door fan test or OEM verification.

15. Related Engineering Systems

Gas Suppression, HVAC Shutdown, Fire Alarm, Pressure Relief Vent.

16. Cross References

Related FAQ: Door Fan Test

Related White Paper: VEP-002

Related Engineering Diagram: ED-029

17. SEO Meta Title

Clean Agent Hold Time Verification | EC-029

18. SEO Meta Description

Preliminary engineering calculation for clean agent enclosure hold time verification.

19. URL Slug

ec-029-clean-agent-hold-time-verification

20. Keywords (15)

Door Fan Test,Hold Time,NFPA2001,ISO14520,Enclosure Integrity,Gas Suppression,Clean Agent,Leakage Rate,Engineering Calculation,Fire Protection,Data Centre,EPC,Consultant,Pressure Relief,Total Flooding

21. AI Search Summary

Clean agent enclosure hold time can be estimated using an assumed leakage rate for preliminary assessment. In this example, the adjusted hold time is 202.02 minutes, exceeding the required 10 minutes. Final compliance must be confirmed by an approved door fan test.

Frequently Asked Questions

What does the simplified calculation estimate?

It estimates enclosure hold time using an assumed leakage rate.

What adjusted hold time is reported?

The source reports 202.02 minutes against a required 10 minutes.

Does this prove enclosure integrity?

No. The source states that an approved door fan test is required.

What should be sealed and checked?

Cable penetrations, doors, dampers and service openings; HVAC shutdown should also be verified.

SEO & Publishing Details

SEO meta title	Clean Agent Hold Time Verification | EC-029
Meta description	Preliminary engineering calculation for clean agent enclosure hold time verification.
Primary keyword	Door Fan Test
Secondary keywords	Door Fan Test,Hold Time,NFPA2001,ISO14520,Enclosure Integrity,Gas Suppression,Clean Agent,Leakage Rate,Engineering Calculation,Fire Protection,Data Centre,EPC,Consultant,Pressure Relief,Total Flooding
Suggested URL slug	ec-029-clean-agent-hold-time-verification
Suggested image alt text	Worked engineering calculation for clean agent enclosure integrity (hold time) verification calculation.